let loose

idiom

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 often used figuratively a director who's willing to let her actors loose to interpret their roles however they see fithow 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.

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