Signal signal: 1.n.a sound or action understood to give a message Chinese soldiers used to send smoke signals. The dog stood by the river and waited for the signal to jump. 2.v.give a signal;express(sth.)in this way The teacher signaled his permission. The thief signaled that the police were coming. 雪警察示意司机把车开走。 The policeman signaled to the driver to move away. End 下一页 Signal 上一页 下一页