| decaffeinate | (verb) remove caffeine from (coffee) | - |
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| decalcify | (verb) remove calcium or lime from | - |
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| (verb) lose calcium or calcium compounds | - |
| decamp | (verb) leave suddenly | Synonyms: skip, vamoose |
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| (verb) run away; usually includes taking something or somebody along | Synonyms: abscond, absquatulate, bolt, go off, make off, run off |
| (verb) leave a camp | Synonyms: break camp |
| decant | (verb) pour out gradually, so as to separate out sediment | Synonyms: pour, pour out |
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| decapitate | (verb) cut the head of | Synonyms: behead, decollate |
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| decarbonate | (verb) remove carbon dioxide from | - |
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| decarbonise | (verb) remove carbon from (an engine) | Synonyms: decarbonize, decarburise, decarburize, decoke |
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| decarbonize | (verb) remove carbon from (an engine) | Synonyms: decarbonise, decarburise, decarburize, decoke |
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| decarboxylate | (verb) lose a carboxyl group | - |
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| (verb) remove a carboxyl group from (a chemical compound) | - |
| decarburise | (verb) remove carbon from (an engine) | Synonyms: decarbonise, decarbonize, decarburize, decoke |
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| decarburize | (verb) remove carbon from (an engine) | Synonyms: decarbonise, decarbonize, decarburise, decoke |
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| decay | (verb) fall into decay or ruin | Synonyms: crumble, dilapidate |
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| (verb) lose a stored charge, magnetic flux, or current | Synonyms: decompose, disintegrate |
| (verb) undergo decay or decomposition | - |
| decease | (verb) pass from physical life and lose all bodily attributes and functions necessary to sustain life | Synonyms: buy the farm, cash in one's chips, choke, conk, croak, die, drop dead, exit, expire, give-up the ghost, go, kick the bucket, pass, pass away, perish, pop off, snuff it |
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| deceive | (verb) cause someone to believe an untruth | Synonyms: betray, lead astray |
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| (verb) be false to; be dishonest with | Synonyms: cozen, delude, lead on |
| decelerate | (verb) lose velocity; move more slowly | Synonyms: retard, slow, slow down, slow up |
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| (verb) reduce the speed of | Synonyms: slow down |
| decentralise | (verb) make less central | Synonyms: decentralize, deconcentrate |
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| decentralize | (verb) make less central | Synonyms: decentralise, deconcentrate |
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| decerebrate | (verb) remove the cerebrum from (a human body) | - |
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| decertify | (verb) cause to be no longer approved or accepted | Synonyms: derecognise, derecognize |
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| dechlorinate | (verb) remove chlorine from (water) | - |
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| decide | (verb) reach, make, or come to a decision about something | Synonyms: determine, make up one's mind |
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| (verb) bring to an end; settle conclusively | Synonyms: adjudicate, resolve, settle |
| (verb) cause to decide | - |
| (verb) influence or determine | - |
| decimalise | (verb) change to the decimal system | Synonyms: decimalize |
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| (verb) change from fractions to decimals | Synonyms: decimalize |
| decimalize | (verb) change to the decimal system | Synonyms: decimalise |
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| (verb) change from fractions to decimals | Synonyms: decimalise |
| decimate | (verb) kill in large numbers | Synonyms: annihilate, carry off, eliminate, eradicate, extinguish, wipe out |
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| (verb) kill one in every ten, as of mutineers in Roman armies | - |
| decipher | (verb) read with difficulty | Synonyms: trace |
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| (verb) convert code into ordinary language | Synonyms: decode, decrypt |
| deck | (verb) knock down with force | Synonyms: coldcock, dump, floor, knock down |
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| (verb) decorate | Synonyms: bedeck, bedight |
| (verb) be beautiful to look at | Synonyms: adorn, beautify, decorate, embellish, grace |
| declaim | (verb) recite in elocution | Synonyms: recite |
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| (verb) speak against in an impassioned manner | Synonyms: inveigh |
| declare | (verb) state emphatically and authoritatively | - |
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| (verb) state firmly | - |
| (verb) make a declaration (of dutiable goods) to a customs official | - |
| (verb) declare to be | Synonyms: adjudge, hold |
| (verb) announce publicly or officially | Synonyms: announce |
| (verb) proclaim one's support, sympathy, or opinion for or against | - |
| (verb) designate (a trump suit or no-trump) with the final bid of a hand | - |
| (verb) authorize payments of | - |
| declassify | (verb) lift the restriction on and make available again | - |
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| declaw | (verb) remove the claws from | - |
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| decline | (verb) grow smaller | Synonyms: go down, wane |
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| (verb) grow worse | Synonyms: worsen |
| (verb) show unwillingness towards | Synonyms: refuse |
| (verb) inflect for number, gender, case, etc. | - |
| (verb) go down | - |
| (verb) fall in value | Synonyms: correct, slump |
| (verb) not accept as true | Synonyms: pass up, refuse, reject, turn down |
| declutch | (verb) disengage the clutch of a car | - |
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| decoct | (verb) extract the essence of something by boiling it | - |
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| (verb) steep in hot water | - |
| (verb) be cooked until very little liquid is left | Synonyms: boil down, concentrate, reduce |
| decode | (verb) convert code into ordinary language | Synonyms: decipher, decrypt |
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| decoke | (verb) remove carbon from (an engine) | Synonyms: decarbonise, decarbonize, decarburise, decarburize |
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| decollate | (verb) cut the head of | Synonyms: behead, decapitate |
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| decolonise | (verb) grant independence to (a former colony) | Synonyms: decolonize |
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| decolonize | (verb) grant independence to (a former colony) | Synonyms: decolonise |
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| decolor | (verb) cause to become white or lighter in color | Synonyms: bleach, bleach out, decolorise, decolorize, decolour, decolourise, decolourize, discolorise, discolorize, discolourise |
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| decolorise | (verb) cause to become white or lighter in color | Synonyms: bleach, bleach out, decolor, decolorize, decolour, decolourise, decolourize, discolorise, discolorize, discolourise |
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| decolorize | (verb) cause to become white or lighter in color | Synonyms: bleach, bleach out, decolor, decolorise, decolour, decolourise, decolourize, discolorise, discolorize, discolourise |
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| decolour | (verb) cause to become white or lighter in color | Synonyms: bleach, bleach out, decolor, decolorise, decolorize, decolourise, decolourize, discolorise, discolorize, discolourise |
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| decolourise | (verb) cause to become white or lighter in color | Synonyms: bleach, bleach out, decolor, decolorise, decolorize, decolour, decolourize, discolorise, discolorize, discolourise |
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| decolourize | (verb) cause to become white or lighter in color | Synonyms: bleach, bleach out, decolor, decolorise, decolorize, decolour, decolourise, discolorise, discolorize, discolourise |
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| decommission | (verb) withdraw from active service | - |
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| decompose | (verb) separate (substances) into constituent elements or parts | Synonyms: break down, break up |
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| (verb) break down | Synonyms: molder, moulder, rot |
| (verb) lose a stored charge, magnetic flux, or current | Synonyms: decay, disintegrate |
| decompress | (verb) become less tense, rest, or take one's ease | Synonyms: loosen up, relax, slow down, unbend, unwind |
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| (verb) decrease the pressure of | Synonyms: depressurise, depressurize |
| (verb) restore to its uncompressed form | Synonyms: uncompress |
| deconcentrate | (verb) make less central | Synonyms: decentralise, decentralize |
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| deconsecrate | (verb) remove the consecration from a person or an object | Synonyms: desecrate, unhallow |
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| deconstruct | (verb) interpret (a text or an artwork) by the method of deconstructing | - |
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| decontaminate | (verb) rid of contamination | - |
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| decontrol | (verb) relax or remove controls of | - |
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| decorate | (verb) provide with decoration | Synonyms: dress |
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| (verb) make more attractive by adding ornament, colour, etc. | Synonyms: adorn, beautify, embellish, grace, ornament |
| (verb) award a mark of honor, such as a medal, to | - |
| (verb) be beautiful to look at | Synonyms: adorn, beautify, deck, embellish, grace |
| decorticate | (verb) remove the cortex of (an organ) | - |
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| (verb) remove the outer layer of | - |
| decouple | (verb) reduce or eliminate the coupling of (one circuit or part to another) | - |
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| (verb) eliminate airborne shock waves from (an explosive) | - |
| (verb) regard as unconnected | Synonyms: dissociate |
| (verb) disconnect or separate | Synonyms: uncouple |
| decoy | (verb) lure or entrap with or as if with a decoy | - |
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| decrease | (verb) decrease in size, extent, or range | Synonyms: diminish, fall, lessen |
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| (verb) make become smaller | Synonyms: lessen, minify |
| decree | (verb) decide with authority | Synonyms: rule |
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| (verb) issue a decree | - |
| decrepitate | (verb) to roast or calcine so as to cause to crackle or until crackling stops | - |
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| (verb) undergo decrepitation and crackle | - |
| decrescendo | (verb) grow quieter | - |
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| decriminalise | (verb) make legal | Synonyms: decriminalize, legalise, legalize, legitimate, legitimatise, legitimatize, legitimise, legitimize |
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| decriminalize | (verb) make legal | Synonyms: decriminalise, legalise, legalize, legitimate, legitimatise, legitimatize, legitimise, legitimize |
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| decry | (verb) express strong disapproval of | Synonyms: condemn, excoriate, objurgate, reprobate |
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| decrypt | (verb) convert code into ordinary language | Synonyms: decipher, decode |
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| decussate | (verb) cross or intersect so as to form a cross | - |
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