Answer: manup

AnswerCrossword Clue
MANUP"Don't be a wimp!"
MANUPShow some backbone, slangily
MANUPPut on one's big-boy pants
MANUP"Don't be a wuss!"
MANUPNot wimp out
MANUPShow some spine
MANUPShow courage, so to speak
MANUP"Come on, stop being such a wimp!"
MANUP"Stop being such a wuss!"
MANUPGet tough
MANUPPut one's big boy pants on
MANUP"Stop your whining!"
MANUP"Take responsibility!"