(idiomatic, intransitive) To become encouraged, reinvigorated, or cheerful; to summon one's courage or spirits; to pluck up courage. / (idiomatic, transitive) To encourage; to hearten.

(US, military slang) A private soldier keen ("bucking") for promotion; an ambitious private.

(US, idiomatic, finance, of a money-market fund) Fall below the value of one dollar per share.

A cocktail of two parts champagne to one part orange juice.

plural of Buck's Fizz

simple past tense and past participle of pass the buck

Third-person singular simple present indicative form of pass the buck

Alternative spelling of megabuck

Having buckteeth

An wild or untamed horse, characteristically difficult to ride. / (by extension) A spirited or uncontrollable person. / A sexual position.