swear up and down

idiom

Definition of swear up and down

US
: to state (something) very strongly and sincerely : to insist She swore up and down (that) she didn't do it.

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“Swear up and down.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/swear%20up%20and%20down. Accessed 9 Jul. 2020.

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