buck up verb 7exclamation 2forms 3 verb7 •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. •To encourage; to hearten.I knew I had to try and buck up the rest of my team as well. •To do better.You better buck up or you'll never make it. •(informal) To pass on to higher authority for resolution. See also pass the buck.He started bucking up everything to management when he didn't get a raise.He just bucked everything risky up to management. •(slang) To hit or fight (someone). •(old-fashioned) To dress oneself up smartly; compare (obsolete) buck ("a fop, dandy") •To hurry up.'Now' said Cameron, 'we must buck up; it's getting late. Now about the child, Boshy: she must come with us, you see.' — 1907 exclamation2 •Cheer up; take courage; take heart. •(old-fashioned) Hurry up; make haste. formsbucked up · bucking up · bucks up