swear down(redirected from swears them down)
1. An exclamation of one's truthfulness. Primarily heard in UK. It was Tommy who bungled up the report, not me. Swear down!
2. To swear to someone that what one has said is true. In this usage, a noun or pronoun can be used between "swear" and "down." Primarily heard in UK. She swore me down that she didn't take the money.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.