I'll be darned

idiom

Definition of I'll be darned 

chiefly US, informal

used to show that one is very surprised about something Well I'll be darned! You actually showed up! often + if I offered to help, but I'll be darned if she didn't do the whole thing herself. sometimes shortened to darned if I told them they wouldn't enjoy the trip but darned if they didn't come anyway.

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evasion of direct action or statement

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