from
The Collaborative International Dictionary of English v.0.48
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}.
[1913 Webster]
For sith [since] I shall forgoon my liberty
At your request. --Chaucer.
[1913 Webster]
And four [days] since Florimell the court forwent.
--Spenser.
[1913 Webster]
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almost superseded by, forego to go before.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.
[1913 Webster]