I'm/I'll be damned if...

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I’m/I’ll be ˈdamned if...

(British English also I’m/I’ll be ˈblowed if ...) (spoken) I certainly will not, do not, etc: I’m damned if I will lend any money to that lazy son of mine.‘Why is she so late?’ ‘I’ll be blowed if I know.’
See also: damned