She was faithful to her word; and when Willoughby called at the cottage, the same day, Elinor heard her express her disappointment to him in a low voice, on being obliged to forego the acceptance of his present.
There are no more uses of "forgo" in the book.
Show samples from other sources
I forgo the blush, since there no longer seems to be a need for it.
Colleen Hoover -- Slammed
So I’d have to forgo some privacy for a few days, so what?