let loose something

let (something) loose

1. To do something in a sudden, fierce, and/or uncontrolled manner; to unleash something, especially that which is violent or destructive. The trapped wolf let loose a bone-chilling howl. The home team began to let loose an unwavering offensive barrage against their cross-town rivals. The owner of the ranch let his hounds loose upon the trespassers.
2. To allow something to spread, grow, or develop in a wild or uncontrolled manner, especially that which is destructive or ruinous. With news of the military junta's governmental overthrow, a wild, riotous pandemonium was let loose across the already unstable country.
See also: let, loose
Farlex Dictionary of Idioms.

let ˈloose something

make a noise or remark, especially in a loud or sudden way: She let loose a stream of abuse.
See also: let, loose, something
Farlex Partner Idioms Dictionary
See also:
  • a fast talker
  • a horse of another
  • a horse of another color
  • a horse of another colour
  • a/the feel of (something)
  • (I) wouldn't (do something) if I were you
  • a straw will show which way the wind blows
  • a crack at (someone or something)
  • all right
  • (you) wanna make something of it?