miǎn​kāi​zūn​kǒu

keep your mouth shut

  1. to be prohibited
    Used in signs or formal contexts to indicate something is not allowed or should not be done
  2. kāi verbparticle
    to open
    to open; to unfold; to unseal; (of flowers) to bloom; to carve or cut open
  3. [honorific]
    an honorific used when referring to people or things related to the person being addressed
  4. mouth
    mouth of a person or animal; (bound form) oral