WordNet (r) 3.0 (2006):
cheer up v 1: cause (somebody) to feel happier or more cheerful; "She tried to cheer up the disappointed child when he failed to win the spelling bee" [syn: cheer, cheer up, jolly along, jolly up] 2: become cheerful [syn: cheer, cheer up, chirk up] [ant: complain, kick, kvetch, plain, quetch, sound off]