pipe down

pipe down idiom
Stop talking, be quiet, as in I wish you children would pipe down. This idiom is also used as an imperative, as in Pipe down! We want to listen to the opera. It comes from the navy, where the signal for all hands to turn in was sometimes sounded on a whistle or pipe. By 1900 it had been transferred to more general use.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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