| abacinate | (verb) blind by holding a red-hot metal plate before someone's eyes | - |
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| bach | (verb) lead a bachelor's existence | Synonyms: bachelor |
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| bachelor | (verb) lead a bachelor's existence | Synonyms: bach |
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| back | (verb) establish as valid or genuine | Synonyms: back up |
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| (verb) strengthen by providing with a back or backing | - |
| (verb) shift to a counterclockwise direction | - |
| (verb) place a bet on | Synonyms: bet on, gage, game, punt, stake |
| (verb) travel backward | - |
| (verb) cause to travel backward | - |
| (verb) support financial backing for | - |
| (verb) be behind; approve of | Synonyms: endorse, indorse, plump for, plunk for, support |
| (verb) give support or one's approval to | Synonyms: endorse, indorse, second |
| (verb) be in back of | - |
| backbite | (verb) say mean things | Synonyms: bitch |
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| backcross | (verb) mate a hybrid of the first generation with one of its parents | - |
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| backdate | (verb) make effective from an earlier date | - |
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| backfire | (verb) set a controlled fire to halt an advancing forest to prairie fire | - |
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| (verb) emit a loud noise as a result of undergoing a backfire | - |
| (verb) come back to the originator of an action with an undesired effect | Synonyms: backlash, recoil |
| background | (verb) understate the importance or quality of | Synonyms: downplay, play down |
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| backhand | (verb) hit a tennis ball backhand | - |
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| backlash | (verb) come back to the originator of an action with an undesired effect | Synonyms: backfire, recoil |
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| backlog | (verb) accumulate and create a backlog | - |
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| backpack | (verb) hike with a backpack | Synonyms: pack |
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| backpedal | (verb) modify one's opinion, make it less strong | - |
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| (verb) pedal backwards on a bicycle | - |
| (verb) step backwards, in boxing | - |
| backscatter | (verb) scatter (radiation) by the atoms of the medium through which it passes | - |
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| backslap | (verb) display excessive cordiality (towards) | - |
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| backslide | (verb) drop to a lower level, as in one's morals or standards | Synonyms: lapse |
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| backspace | (verb) hit the backspace key on a computer or typewriter keyboard | - |
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| backstitch | (verb) do backstitches | - |
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| backstop | (verb) act as a backstop | - |
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| backstroke | (verb) swim on one's back | - |
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| backtrack | (verb) retrace one's course | Synonyms: double back, turn back |
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| bacterise | (verb) subject to the action of bacteria | Synonyms: bacterize |
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| bacterize | (verb) subject to the action of bacteria | Synonyms: bacterise |
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| follback | (verb) to return someone's following of you on a social media platform | - |
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| fullback | (verb) play the fullback | - |
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| hibachi | (verb) cook over a hibachi grill | - |
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| piggyback | (verb) bring into alignment with | - |
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| (verb) support on the back and shoulders | - |
| (verb) haul by railroad car | - |
| (verb) haul truck trailers loaded with commodities on railroad cars | - |
| (verb) ride on someone's shoulders or back | - |
| quarterback | (verb) play the quarterback | - |
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