Interjection
Cheer up; take courage; take heart.
Hurry up; make haste.
Verb
To become encouraged, reinvigorated, or cheerful; to summon one's courage or spirits; to pluck up courage.
To encourage; to hearten.
To do better.
To dress oneself up smartly; compare (obsolete) buck ("a fop, dandy") .mw-parser-output .defdate{font-size:smaller}
To pass on to higher authority for resolution. See also pass the buck.
To hurry up.
To hit or fight (someone).