let one loose

let one loose (third-person singular simple present lets one loose, present participle letting one loose, simple past and past participle let one loose)

1. (euphemistic) To break wind; to fart.

   Uh oh. I gotta let one loose.

• (euphemistic: to break wind): fart, break wind, pass gas, toot, pass wind, cut the cheese, cut one loose, step on a duck, step on a frog