swear

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Related to swear blind: swear up and down

swear

v. 1) to declare under oath that one will tell the truth (sometimes "the truth, the whole truth and nothing but the truth"). Failure to tell the truth, and do so knowingly, is the crime of perjury. 2) to administer an oath to a witness that he/she will tell the truth, which is done by a notary public, a court clerk, a court reporter, or anyone authorized by law to administer oaths. 3) to install into office by administering an oath. 4) to use profanity. (See: oath, perjury, notary public)

Copyright © 1981-2005 by Gerald N. Hill and Kathleen T. Hill. All Right reserved.

swear

to take an oath.
Collins Dictionary of Law © W.J. Stewart, 2006

TO SWEAR. To take an oath, judicially administered. Vide Affirmation; Oath.
     2. To swear also signifies to use such profane language as is forbidden by law. This is generally punished by statutory provisions in the several states.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
References in periodicals archive ?
"We make you believe the unbelievable and swear blind the impossible has just happened."
Some people will swear blind that they don't smoke when you can smell the smoke on their breath.
They are not malicious but if you ask him if he has done something naughty he will swear blind it wasn't him.
He will swear blind Coca-Cola are still happy, even though their cup final doesn't include either half of the Old Firm.
Then why does one child swear blind they don't want to go to the toilet when you're standing right next to one, only to then decide to change their mind 20 minutes later when you're halfway round the queue for the next ride?!
Although I couldn't swear blind to this, I'd rather think that registering it as a trademark might well have slipped his mind, seeing he had wars to attend to and a few scores to settle with those pesky Welsh across the border.
A MOST of us could swear blind we're a few quid short of what we expect because we do tend to forget that extra coffee or DVD we bought.
I swear blind that things ain't what they used to be!
Having known alcoholics myself, I have seen how they will look you in the eye when they are at their most inebriated and swear blind they don't have a problem.