Source : Webster's Revised Unabridged Dictionary (1913)

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.
                                                  --Herbert.

   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.
                                                  --Keble.

            [He] never forewent an opportunity of honest profit.
                                                  --R. L.
                                                  Stevenson.

   Note: Forgo is the better spelling etymologically, but the
         word has been confused with {Forego}, to go before.