v. renounce or deny something, especially under oath; swear falsely, usually under pressure
The captured knight could escape death only if he agreed to forswear Christianity and embrace Islam as the one true faith.
Sentence in Classic:
To have lost the godlike conceit that we may do what we will, and not to have acquired a homely zest for doing what we can, shows a grandeur of temper which cannot be objected to in the abstract, for it denotes a mind that, though disappointed, forswears compromise.
Return of the Native By Thomas Hardy Context
Being returned home at last, Captain Pollard once more sailed for the Pacific in command of another ship, but the gods shipwrecked him again upon unknown rocks and breakers; for the second time his ship was utterly lost, and forthwith forswearing the sea, he has never tempted it since.
Moby Dick By Herman Melville Context