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}]