C2 to hear what other people are saying without intending to and without their knowledge无意中听到,偶然听到
I overheard a very funny conversation on the bus this morning.今天早上我坐公共汽车时,无意中听到一段好笑的谈话。
[ + obj + -ing verb ] He overheard his daughter telling her doll not to be so naughty.他碰巧听到女儿对她的毛绒玩具说别那么淘气。 I'm sorry, I couldn't help overhearing.很抱歉,我是碰巧听到的。