swear blind

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swear blind

To make a very serious, solemn pledge, especially that one is telling the truth. Janet has sworn blind that she wasn't the one to betray me, and I believe her.
See also: blind, swear

swear blind

BRITISH or

swear up and down

AMERICAN
If someone swears blind that something is true, they insist that they are telling you the truth. He swore blind that he hadn't taken the money. He swears blind that he bears no grudges against Manchester United for sacking him, but I don't know if I believe him.
See also: blind, swear

swear blind

affirm something in an emphatic manner. British informal
A North American variant of this expression is swear up and down .
See also: blind, swear

swear ˈblind (that)...

(informal) say that something is definitely true: She swore blind that she had not taken the money, and I believe her.
See also: swear
References in periodicals archive ?
Mosley beat Golden Boy on a split decision three years ago but got the nod from all three judges in the rematch despite many ringside and TV viewers swearing blind that De la Hoya had won by a mile.
It was a joy to watch Donald (expletive deleted) Rumsfeld pretending he'd 'tendered his resignation' when anyone could see he'd been dragged kicking and screaming towards the exit door, still swearing blind that the weapons of mass destruction had been there, right where he said they were.
The lads are swearing blind the ball got a touch off a Hearts player.
I think she will soon be swearing blind that she was abducted from her kitchenette and impregnated by aliens.
And until yesterday there were others swearing blind he would get a soft judge, someone with Labour links, someone who would impose community service.
He went to his death swearing blind that his design for an inflatable dirigible with wings had flown, but there was no record of it.