(idiomatic, intransitive) To become encouraged, reinvigorated, or cheerful; to summon one's courage or spirits; to pluck up courage.
I realized I needed to buck up and tackle the problem head-on.
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(idiomatic, dated) Hurry up; make haste.
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(idiomatic) Cheer up; take courage; take heart.
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Slang from Black American Vernacular English (AAVE), hip-hop, drag and ballroom culture, the Caribbean, and NYC street vocabulary. The single largest source of new mainstream English slang in living memory.
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