Definitions
Wiktionary
- v. idiomatic, intransitive To be quiet; to refrain from being noisy.
WordNet 3.0
- v. become quiet or quieter
Examples
“He threw the pipe down and muttered, 'Faeces, nothing but faeces.”
“He set his pipe down in the ashtray and looked steadily at Mr. Speidel.”
Lists
These user-created lists contain the word ‘pipe down’.
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•Open List: Be Vewwy, Vewwy Quiet....
Imperatives only, please. :-)
button up, hush, clam up, close up, don't say boo, shut it, pipe down, keep mum, dummy up, shut up, belt up, hush up and 89 more...
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old timey talk
Words or Sayings from the 1920's or whatever that no one really uses anymore (at least in that context).
scram, bearcat, heavens to betsy, dick, double-cross, ducky, gams, goofy, hooch, jalopy, john, joe and 174 more...
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slumry's Words
cattywampus, ingratiate, lackadaisical, exactitude, exfoliate, fulminate, circumnavigation, circuitous, debride, sidle, sequester, chicory and 1002 more...
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Three Sheets to the Wind
Common words or phrases of nautical origin that have taken on different or metaphorical meanings. Chained_bear and I tossed a coin over who would make the list. I won (or lost, depending on how you...
scuttlebutt, taken aback, brass monkey, boot camp, clean bill of health, three sheets to t..., the devil to pay, between the devil..., by and large, the whole nine yards, mind your ps and qs, slush fund and 116 more...
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Quiet Alternatives
Quiet
tacit, taciturn, still, hushed, dampen, soft pedal, clammed up, pipe down, hush-hush, shush, muffled, toned down and 34 more...
Tweets
Looking for tweets for pipe down.

reesetee Believed to have been coined in the early 1800s. From OED: "The action of piping down a crew; a call on the boatswain's pipe signalling sailors to retire for the night; the time at which this signal is sounded." Jan 7, 2008