keep one's mouth shut

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keep one's mouth shut

  1. (idiomatic) To keep a secret; to refrain from speaking indiscreetly or carelessly; broadly, to refrain from speaking altogether.
    • 1906, Upton Sinclair, The Jungle, Chapter 25
      He thought that he could get him a regular salary if he would come to Packingtown and do as he was told, and keep his mouth shut.
    • 2004, Alan Cowell, "Charles Joins Fray Over Himself," New York Times, 23 Nov. (retrieved 25 Oct. 2008):
      Charles has failed to follow the example of his mother, the queen, who has heroically kept her mouth shut for more than 50 years.