let somebody/something loose
let (someone or something) loose
To make free or give up control of something or someone; to release or discharge something or someone, as from confinement. Due to a lack of evidence, the suspects were let loose by police. Samantha was suspended for letting mice loose throughout the school.
(with something) Go to let go (with something).
let ˈloose(British English) (American English cut ˈloose) (informal) do something or happen in a way that is not controlled: Teenagers need a place to let loose.
let somebody/something ˈloose
1 free somebody/something from whatever holds them/it in place: She let her hair loose and it fell around her shoulders. ♢ Who let the dogs loose?
2 give somebody complete freedom to do what they want in a place or situation: He was at last let loose in the kitchen. ♢ A team of professionals were let loose on the project.