'let go' definitions:

Definition of 'let go'

(from WordNet)
verb
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, let go, release, relinquish] [ant: hold, take hold]
verb
Be relaxed; "Don't be so worried all the time--just let go!"

Synonyms of 'let go'

From: Moby Thesaurus