swear blind
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Related to swear blind: swear up and down
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.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
swear blind
BRITISH orswear up and down
AMERICANIf 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.
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012
swear blind
affirm something in an emphatic manner. British informalA North American variant of this expression is swear up and down .
Farlex Partner Idioms Dictionary © Farlex 2017
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
Farlex Partner Idioms Dictionary © Farlex 2017