Cut Loose Meaning

(idiomatic, intransitive) To behave in an uncontrolled manner.

Example: To party without restraint.
Elvis Presley, Relax:
  Cut loose, let your hair down honey
  Unwind, turn the lights down low
  Relax, let's uncork the stopper
  Come to papa, come on let's go
To act freely.
2011 February 12, Mark Orlovac, “England 59-13 Italy”[1], BBC:
  England cut loose at the end of the half, Ashton, Mark Cueto and Mike Tindall all crossing before the break.