Definitions from Wiktionary (buck up)

▸ verb:  (idiomatic, intransitive) To become encouraged, reinvigorated, or cheerful; to summon one's courage or spirits; to pluck up courage.
▸ verb:  (idiomatic, transitive) To encourage; to hearten.
▸ verb:  (idiomatic, intransitive) To do better.
▸ verb:  (idiomatic, intransitive, dated) To dress oneself up smartly; compare (obsolete) buck ("a fop, dandy")
▸ verb:  (idiomatic, transitive, colloquial) To pass on to higher authority for resolution. See also pass the buck.
▸ verb:  (obsolete) To hurry up.
▸ verb:  (idiomatic, transitive, African-American Vernacular, slang) To hit or fight (someone).






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