WordNet sense 1 (do without or cease to hold or adhere to):

forgo, waive, foreswear, dispense with

WordNet sense 2 (part with a possession or right):

free, release, resign, release, resign, give up

WordNet sense 3 (turn away from; give up):

quit, renounce

WordNet sense 4 (release, as from one's grip):

let go of, let go

WordNet sense 5 (relinquish to the power of another; yield to the control of another):

surrender