| black | (verb) make or become black | Synonyms: blacken, melanise, melanize |
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| blackball | (verb) expel from a community or group | Synonyms: ban, banish, cast out, ostracise, ostracize, shun |
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| (verb) vote against; refuse to endorse; refuse to assent | Synonyms: negative, veto |
| blackberry | (verb) pick or gather blackberries | - |
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| blacken | (verb) make or become black | Synonyms: black, melanise, melanize |
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| (verb) burn slightly and superficially so as to affect color | Synonyms: char, scorch, sear |
| blackguard | (verb) use foul or abusive language towards | Synonyms: abuse, clapperclaw, shout |
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| (verb) subject to laughter or ridicule | Synonyms: guy, jest at, laugh at, make fun, poke fun, rib, ridicule, roast |
| blackjack | (verb) exert pressure on someone through threats | Synonyms: blackmail, pressure |
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| blacklead | (verb) cover with graphite | - |
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| blackleg | (verb) take the place of work of someone on strike | Synonyms: fink, rat, scab |
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| blacklist | (verb) put on a blacklist so as to banish or cause to be boycotted | - |
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| blackmail | (verb) obtain through threats | - |
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| (verb) exert pressure on someone through threats | Synonyms: blackjack, pressure |
| blacktop | (verb) coat with blacktop | - |
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| blackwash | (verb) color with blackwash | - |
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| (verb) bring (information) out of concealment | - |
| clack | (verb) speak (about unimportant matters) rapidly and incessantly | Synonyms: blab, blabber, chatter, gabble, gibber, maunder, palaver, piffle, prate, prattle, tattle, tittle-tattle, twaddle |
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| (verb) make a clucking sounds, characteristic of hens | Synonyms: click, cluck |
| (verb) make a rattling sound | Synonyms: brattle, clatter |
| lack | (verb) be without | Synonyms: miss |
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| (verb) To be insufficiently prepared | - |
| shellack | (verb) cover with shellac | Synonyms: shellac |
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| slack | (verb) release tension on | - |
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| (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 | - |
| slacken | (verb) become looser or slack | - |
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| (verb) make slack as by lessening tension or firmness | Synonyms: remit |
| (verb) become slow or slower | Synonyms: slack, slow, slow down, slow up |
| (verb) make less active or fast | Synonyms: relax, slack, slack up |