开口

kāikǒu

(1) [open one's mouth; begin to speak; start to talk]∶张口说或笑

没等我开口, 他就抢先替我说了

(2) [put the first edge on a knife]∶新刃磨、 抢, 使之锋利

(3) [break]∶河水冲破堤防