let one rip

slang To fart loudly or profusely. I can't believe you let one rip in the car. Now we have to smell it all the way home!

let it

/'er rip Informal

To allow something to start or happen with vigor or energy.

See also: let

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

See also:

let (one) have (one's) head
air biscuit
let her rip
let it rip
let rip
let something rip
let (something) rip
let go and let God
let (someone or something) get out of (something)
let (someone or something) get out

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