From swear + -eth, the archaic third-person singular present tense suffix
- (archaic) third-person singular simple present indicative form of swear
- 1611, Bible (KJV), Matthew 23:20-21:
- Whoso therefore shall swear by the altar, sweareth by it, and by all things thereon. And whoso shall swear by the temple, sweareth by it, and by him that dwelleth therein.