Definition of "let loose" [let loose]

• To free; to release from restraint. (verb)
• To shout, make a loud sound, or perform a sudden, vehement action; to behave in a raucous, frenzied manner. (verb)

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• "Damn it to hell— He let loose with a string of curses as he thrust his gun into his holster and wrapped his arms around her before she could totally lose it and slide bonelessly to the floor."
• "As Matt let loose with a series of idiotic dog-coaxing sounds, Carly squinched up her eyes and stared at the parts of the animal she could see."
• "His expression went dark as he pointed to something on its back and let loose with some angry-sounding Spanish."