Definition of let loose
1
: to allow (someone or something) to move or go freely
- He let the dogs loose in the courtyard.
- cattle let loose to graze on the green fields
- a director who's willing to let her actors loose to interpret their roles however they see fit
- how to stop the violence that has been let loose on the city
2
: to produce (something, such as a cry) in a sudden and forceful way
- The crowd let loose an enormous groan when the pass was intercepted.
- She let loose (with) a scream.
