jump off 1. 跳离 He jumped off the wall. 他从墙上跳下。 The bus stopped and he jumped off (it). 公共汽车一停，他便跳下车。 2. 出发；开始；开始进攻 The attack jumped off under cover of a barrage. 进攻在炮火的掩护下开始了。 At 3 a.m. the assault companies jumped off. 凌晨3点，各突击连开始进攻。 3. 〈美〉离开 4. (骑马超越障碍比赛中)平分决胜