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

Derived forms: let loose, lets loose, letting loose

Type of: evince [formal], express, let go, let go of, release, relinquish, show