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Verb: let loose  let loos
  1. Express audibly; make sounds (not necessarily words)
    "He let loose strange sounds that nobody could understand";
    - utter, emit, let out
  2. Turn loose or free from restraint
    "let loose mines";
    - unleash, loose

Derived forms: let loose, letting loose, lets loose

Type of: let go, let go of, release, relinquish