let loose
     v 1: express audibly; utter sounds not necessarily words; "she
          let out a big heavy sigh"; "he uttered strange sounds
          that nobody could understand" syn: utter, emit, let
          out
     2: turn loose or free from restraint; "let loose mines"; "loose
        terrible plagues upon humanity" syn: unleash, loose
see also:
utter emit let out unleash loose 

44 moby thesaurus words for "let loose":
   carouse, cast loose, celebrate, cut loose, debauch, demobilize,
   discharge, dismiss, give way to, go all out, go bail for,
   go flat out, go unrestrained, grant bail to, hell around, jollify,
   jolly, lark, leave go, let go, let go free, let loose of, let off,
   let off steam, let out, make merry, make whoopee, open up, parole,
   put on parole, raise hell, release, revel, roister, run wild,
   see life, skylark, spree, step out, unclasp, unclutch, unhand,
   wanton, whoop it up