柯林斯词典sit-up (also situp) (sit-ups) 1. N-COUNT Sit-ups are exercises that you do to strengthen your stomach muscles. They involve sitting up from a lying position while keeping your legs straight on the floor. 仰臥起坐 He does 100 sit-ups each day. 他每天做100個仰臥起坐。 返回 sit-up