The Collaborative International Dictionary of English v.0.48:
Forego \Fore*go"\, v. t. [imp. Forewent 2; p. p. Foregone
(?; 115); p. pr. & vb. n. Foregoing.] [See Forgo.]
1. To quit; to relinquish; to leave.
Stay at the third cup, or forego the place.
2. To relinquish the enjoyment or advantage of; to give up;
to resign; to renounce; -- said of a thing already
enjoyed, or of one within reach, or anticipated.
All my patrimony,,
If need be, I am ready to forego. --Milton.
Thy lovers must their promised heaven forego.
[He] never forewent an opportunity of honest profit.
Note: Forgo is the better spelling etymologically, but the
word has been confused with Forego, to go before.