release, relinquish, resign, free, give up -- (part with a possession or right; "I am relinquishing my bedroom to the long-term house guest"; "resign a claim to the throne")
waive, relinquish, forgo, forego, foreswear, dispense with -- (do without or cease to hold or adhere to; "We are dispensing with formalities"; "relinquish the old ideas")
foreswear, renounce, quit, relinquish -- (turn away from; give up; "I am foreswearing women forever")
let go of, let go, release, relinquish -- (release, as from one's grip; "Let go of the door handle, please!"; "relinquish your grip on the rope--you won't fall")