闭门塞窦

閉門塞竇
bìménsèdòu
to close doors and block openings (idiom); mounting a strict defense

CEDICT

防卫坚固。

重編國語辭典

防卫坚固

維基詞典

Entry Composition

1 闭门 bìmén to close a door
2 塞 sè (bound form) to block; to obstruct
3 窦 dòu
  1. (literary) hole; aperture
  2. (anatomy) cavity; sinus