plural of open and shut case

(minced oath, euphemistic, slang) shut the fuck up (usually expressing disbelief)

(idiomatic) To stop talking; to be quiet.

Alternative form of with one's eyes closed

(idiomatic) To ignore or deliberately overlook.

(idiomatic) An exclamation of surprise or astonishment.

(idiomatic) To desist from saying something unless one is able to prove it; to act in a manner that makes further talk unnecessary.

(idiomatic) To keep a secret; to refrain from speaking indiscreetly or carelessly; broadly, to refrain from speaking altogether.

simple past tense and past participle of keep one's mouth shut

Third-person singular simple present indicative form of keep one's mouth shut