buck up

verb

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.”
To dress oneself up smartly; compare (obsolete) buck ("a fop, dandy")
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.”
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.'”
To hit or fight (someone).