隔墙有耳

隔牆有耳
géqiángyǒuěr
the walls have ears (idiom)

CEDICT

牆外有人偷听，祕密外洩。语本《管子．君臣下》：「古者有二言：牆有耳、伏寇在侧。牆有耳者，微谋外泄之谓也。」后比喻说祕密时，要防备有人偷听。《野叟曝言．第九五回》：「隔牆有耳，沉兄怎这样口敞？」也作「隔牆还有耳」、「隔窗有耳」。

重編國語辭典

Homographs

隔墙有耳 géqiángyǒu'ěr

Entry Composition

1 隔墙 géqiáng partition wall
2 有 yǒu
  1. to have; there is
  2. (bound form) having; with; -ful; -ed; -al (as in 有意 yǒuyì intentional)
3 耳 ěr
  1. ear
  2. handle (archaeology)
  3. and that is all (Classical Chinese)