Forgo \For*go"\, v. t. [imp. {Forwent}; p. p. {Forgone}; p. pr. & vb. n. {Forgoing}.] [OE. forgan, forgon, forgoon, AS. forg[=a]n, prop., to go past, hence, to abstain from; pref. for- + g[=a]n to go; akin to G. vergehen to pass away, to transgress. See {Go}, v. i.] 1. To pass by; to leave. See 1st {Forego}.
For sith [since] I shall forgoon my liberty At your request. --Chaucer.
And four [days] since Florimell the court forwent. --Spenser.
2. to abstain from; to do without; to refrain from; to renounce; -- said of a thing already enjoyed, or of one within reach, or anticipated. See 1st {forego}, 2. [PJC]
Note: This word in spelling has been confused with, and almost superseded by, forego to go before. Etymologically the form forgo is correct.