| antiblack | (adjective) discriminatory especially on the basis of race or religion | Synonyms: anti-Semite, racist |
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| black | (adjective) being of the achromatic color of maximum darkness; having little or no hue owing to absorption of almost all incident light | - |
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| (adjective) of or belonging to a racial group especially of sub-Saharan African origin | - |
| (adjective) marked by anger or resentment or hostility | - |
| (adjective) (of the face) made black especially as with suffused blood | Synonyms: blackened |
| (adjective) (of intelligence operations) deliberately misleading | - |
| (adjective) extremely dark | Synonyms: pitch-black, pitch-dark |
| (adjective) soiled with dirt or soot | Synonyms: smutty |
| (adjective) (used of conduct or character) deserving or bringing disgrace or shame | Synonyms: disgraceful, ignominious, inglorious, opprobrious, shameful |
| (adjective) stemming from evil characteristics or forces; wicked or dishonorable | Synonyms: dark, sinister |
| (adjective) offering little or no hope | Synonyms: bleak, dim |
| (adjective) distributed or sold illicitly | Synonyms: black-market, bootleg, contraband, smuggled |
| (adjective) harshly ironic or sinister | Synonyms: grim, mordant |
| (adjective) (of coffee) without cream or sugar | - |
| (adjective) (of events) having extremely unfortunate or dire consequences; bringing ruin | Synonyms: calamitous, disastrous, fatal, fateful |
| (noun) black clothing (worn as a sign of mourning) | - |
| (noun) (board games) the darker pieces | - |
| (noun) the quality or state of the achromatic color of least lightness (bearing the least resemblance to white) | Synonyms: blackness, inkiness |
| (noun) total absence of light | Synonyms: blackness, lightlessness, pitch blackness, total darkness |
| (verb) make or become black | Synonyms: blacken, melanise, melanize |
| bootblack | (noun) a person who polishes shoes and boots | Synonyms: shoeblack |
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| caipiblack | (noun) a variation of the Caipirinha made with black vodka instead of cachaça. | - |
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| clack | (noun) a simple valve with a hinge on one side; allows fluid to flow in only one direction | Synonyms: clack valve, clapper valve |
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| (noun) a sharp abrupt noise as if two objects hit together; may be repeated | Synonyms: clap |
| (verb) speak (about unimportant matters) rapidly and incessantly | Synonyms: blab, blabber, chatter, gabble, gibber, maunder, palaver, piffle, prate, prattle, tattle, tittle-tattle, twaddle |
| (verb) make a clucking sounds, characteristic of hens | Synonyms: click, cluck |
| (verb) make a rattling sound | Synonyms: brattle, clatter |
| flack | (noun) artillery designed to shoot upward at airplanes | Synonyms: ack-ack, ack-ack gun, antiaircraft, antiaircraft gun, flak, pom-pom |
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| (noun) intense adverse criticism | Synonyms: attack, blast, fire, flak |
| (noun) a slick spokesperson who can turn any criticism to the advantage of their employer | Synonyms: flack catcher, flak, flak catcher |
| lack | (noun) the state of needing something that is absent or unavailable | Synonyms: deficiency, want |
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| (verb) be without | Synonyms: miss |
| (verb) To be insufficiently prepared | - |
| lampblack | (noun) a black colloidal substance consisting wholly or principally of amorphous carbon and used to make pigments and ink | Synonyms: carbon black, crock, smut, soot |
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| polack | (noun) a person of Polish descent | - |
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| pollack | (noun) important food and game fish of northern seas (especially the northern Atlantic); related to cod | Synonyms: Pollachius pollachius, pollock |
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| (noun) lean white flesh of North Atlantic fish; similar to codfish | Synonyms: pollock |
| shellack | (verb) cover with shellac | Synonyms: shellac |
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| shoeblack | (noun) a person who polishes shoes and boots | Synonyms: bootblack |
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| slack | (adjective) not tense or taut | Synonyms: loose |
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| (adjective) lacking in rigor or strictness | Synonyms: lax |
| (adjective) flowing with little speed as e.g. at the turning of the tide | - |
| (noun) a cord or rope or cable that is hanging loosely | - |
| (noun) the quality of being loose (not taut) | Synonyms: slackness |
| (noun) a stretch of water without current or movement | Synonyms: slack water |
| (noun) a soft wet area of low-lying land that sinks underfoot | Synonyms: mire, morass, quag, quagmire |
| (noun) a noticeable deterioration in performance or quality | Synonyms: drop-off, falling off, falloff, slump |
| (noun) dust consisting of a mixture of small coal fragments and coal dust and dirt that sifts out when coal is passed over a sieve | - |
| (verb) release tension on | - |
| (verb) make less active or fast | Synonyms: relax, slack up, slacken |
| (verb) make less active or intense | Synonyms: abate, slake |
| (verb) become slow or slower | Synonyms: slacken, slow, slow down, slow up |
| (verb) cause to heat and crumble by treatment with water | Synonyms: slake |
| (verb) become less in amount or intensity | Synonyms: abate, die away, let up, slack off |
| (verb) be inattentive to, or neglect | - |
| (verb) avoid responsibilities and work, be idle | - |