swear blind

idiom

Definition of swear blind

British
: to state (something) very strongly and sincerely : to insist He swore blind (that) he was innocent.

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“Swear blind.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/swear%20blind. Accessed 9 Aug. 2020.

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