let loose something
US /lɛt luːs ˈsʌmˌθɪŋ/
UK /lɛt luːs ˈsʌmˌθɪŋ/

1.
melepaskan, membiarkan bebas
to release something, often with force or without restraint
:
•
The dog was let loose in the park to run freely.
Anjing itu dilepaskan di taman untuk berlari bebas.
•
He let loose a string of curses after hitting his thumb.
Dia melontarkan serangkaian sumpah serapah setelah ibu jarinya terbentur.