| obey | (verb) be obedient to | - |
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| obfuscate | (verb) make obscure or unclear | - |
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| object | (verb) express or raise an objection or protest or criticism or express dissent | - |
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| (verb) be averse to or express disapproval of | - |
| objectify | (verb) make impersonal or present as an object | Synonyms: depersonalise, depersonalize |
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| (verb) make external or objective, or give reality to | Synonyms: exteriorise, exteriorize, externalise, externalize |
| objurgate | (verb) express strong disapproval of | Synonyms: condemn, decry, excoriate, reprobate |
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| (verb) censure severely | Synonyms: castigate, chasten, chastise, correct |
| obligate | (verb) bind by an obligation; cause to be indebted | Synonyms: bind, hold, oblige |
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| (verb) commit in order to fulfill an obligation | - |
| (verb) force somebody to do something | Synonyms: compel, oblige |
| oblige | (verb) bind by an obligation; cause to be indebted | Synonyms: bind, hold, obligate |
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| (verb) provide a service or favor for someone | Synonyms: accommodate |
| (verb) force somebody to do something | Synonyms: compel, obligate |
| obliterate | (verb) remove completely from recognition or memory | Synonyms: efface |
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| (verb) make undecipherable or imperceptible by obscuring or concealing | Synonyms: blot out, hide, obscure, veil |
| (verb) mark for deletion, rub off, or erase | Synonyms: kill, wipe out |
| (verb) do away with completely, without leaving a trace | - |
| obnubilate | (verb) make unclear, indistinct, or blurred | Synonyms: blur, confuse, obscure |
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| (verb) make less visible or unclear | Synonyms: becloud, befog, cloud, fog, haze over, mist, obscure |
| obscure | (verb) make unintelligible or unclear | Synonyms: bedim, overcloud |
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| (verb) make undecipherable or imperceptible by obscuring or concealing | Synonyms: blot out, hide, obliterate, veil |
| (verb) reduce a vowel to a neutral one, such as a schwa | - |
| (verb) make unclear, indistinct, or blurred | Synonyms: blur, confuse, obnubilate |
| (verb) make less visible or unclear | Synonyms: becloud, befog, cloud, fog, haze over, mist, obnubilate |
| observe | (verb) stick to correctly or closely | Synonyms: keep, maintain |
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| (verb) make mention of | Synonyms: mention, note, remark |
| (verb) watch attentively | - |
| (verb) observe with care or pay close attention to | Synonyms: note, take note |
| (verb) discover or determine the existence, presence, or fact of by perception with the eyes | Synonyms: detect, discover, find, notice |
| (verb) follow with the eyes or the mind | Synonyms: follow, keep an eye on, watch, watch over |
| (verb) show respect towards | Synonyms: abide by, honor, honour, respect |
| (verb) behave as expected during of holidays or rites | Synonyms: celebrate, keep |
| (verb) conform one's action or practice to | Synonyms: keep |
| obsess | (verb) haunt like a ghost; pursue | Synonyms: ghost, haunt |
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| (verb) be preoccupied with something | - |
| obsolesce | (verb) become obsolete, fall into disuse | - |
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| obstinate | (verb) persist stubbornly | - |
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| obstipate | (verb) constipate severely | - |
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| obstruct | (verb) block passage through | Synonyms: block, close up, impede, jam, obturate, occlude |
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| (verb) shut out from view or get in the way so as to hide from sight | Synonyms: block |
| (verb) hinder or prevent the progress or accomplishment of | Synonyms: block, blockade, embarrass, hinder, stymie, stymy |
| obtain | (verb) receive a specified treatment (abstract) | Synonyms: find, get, incur, receive |
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| (verb) come into possession of | - |
| (verb) be valid, applicable, or true | Synonyms: hold, prevail |
| obtrude | (verb) thrust oneself in as if by force | Synonyms: intrude |
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| (verb) push to thrust outward | Synonyms: push out, thrust out |
| obtund | (verb) reduce the edge or violence of | - |
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| obturate | (verb) block passage through | Synonyms: block, close up, impede, jam, obstruct, occlude |
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| obviate | (verb) prevent the occurrence of; prevent from happening; to protect from or to keep away anything undesirable; to ward off | Synonyms: avert, avoid, debar, deflect, fend off, forefend, forfend, head off, stave off, ward off |
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| (verb) get rid of something | Synonyms: eliminate, rid of |