Source : WordNet®

let go
     v 1: release, as from one's grip; "Let go of the door handle,
          please!"; "relinquish your grip on the rope--you won't
          fall" [syn: {let go of}, {release}, {relinquish}] [ant:
          {hold}]
     2: be relaxed; "Don't be so worried all the time--just let go!"