隔墻有耳（隔牆有耳）　

◎ 隔墻有耳 géqiáng-yǒu’ěr

[Beware of eavesdroppers as little pitchers have long ears.] 隔著墻有人偷聽(tīng)。比喻很秘密的事也會(huì)泄漏。也用來(lái)勸人說(shuō)話留心,免得泄漏

常言道:“隔墻須有耳,窗外豈無(wú)人”,只可你知我知。——《水滸傳》十六回