pipe down

pipe down (third-person singular simple present pipes down, present participle piping down, simple past and past participle piped down)

1. (idiomatic, intransitive) To be quiet; to refrain from being noisy.

   Pipe down, children. I'm trying to work.

2. To dismiss from muster, as a ship's company.

• (be quiet): be quiet, put a sock in it, shut up

• pipe up

• downpipe