A mild expletive or euphemistic oath, mainly American dialectal, often expressing frustration or surprise; to utter such an oath.
A corruption or euphemistic alteration of 'concern' or 'curse'; American frontier dialect softened the word to avoid blasphemy while still expressing emotion.
Consarn is a beautiful example of linguistic politeness—people wanted a strong exclamation but without actually swearing, so they twisted 'curse' or 'concern' into 'consarn,' giving them plausible deniability about what they were actually saying!
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