Pipe down

    安静下来

    A: Can I have an ice-cream at the next gas station?

    B: I want coke and some chips!

    C: If you don't pipe down, we're turning this car around and going straight home!

    Note: This idiom means to "shut up, be quiet." On sailing ships signals were given to the crew by sounding the boatswain's pipe. One such was "piping down the hammocks" which was the signal to go below decks and retire for the night. When an officer wanted a sailor to be dismissed below he would have him "piped down." This usage is recorded in the British Royal Navy workbooks from the 18th century. If there was a disturbance onboard the ship, officers could quell it by sending the crew below decks, that is, by piping them down.