outsworn

He felt sure that the Boy in his present mood would have outsworn him without scruple had it pleased him to maintain his assertion, so he opened his piano in silence, and the music began.

The Heavenly Twins Madame Sarah Grand

I ought, perhaps, to have had him up before a magistrate provided I could have found one, but I was in a wild place and he had a clan about him, and if I had had him up I have no doubt I should have been outsworn.

George Borrow and His Circle Wherein May Be Found Many Hitherto Unpublished Letters Of Borrow And His Friends Clement King Shorter 1891