From Longman Dictionary of Contemporary Englishdarndarn1 /dɑːn $ dɑːrn/ (also darn it/him/them etc) interjection American English informal used to show that you are annoyed or disappointed SYN damn Darn! I forgot my keys! Darn it! I’ll have to do it all myself!darndarn2 (also darned) adjective spoken informal 1 VERYused to emphasize how bad, stupid, unfair etc someone or something is SYN damn The darn fool got lost on the way.2 → a darn sight better/harder etc —darn, darned adverb It was a darned good movie.
Examples from the Corpus
darn• The first order of business is for the guys to save themselves from the elements, starvation, and that darn bear.• Or the whole darn lot of them in one ghastly premeditated assault?• Darned mosquito. It keeps flying around me.• I think I know a little bit about this darn stuff.• Then leave the darn thing alone.• The Raiders made theirs on the sideline watching Testaverde realize that he just might be able to win this darn thing.darndarn3 verb [transitive] DCto repair a hole in a piece of clothing by stitching wool over it Her cardigan had been darned at the elbows.► see thesaurus at repair→ See Verb tableExamples from the Corpus
darn• Considering the arduous nature of their work, these require darning and stitching all too often.• Gosh darn it, I expected it to be done.• Loopy Lil gently smiled her new even welfare smile while Mrs Hollidaye darned lisle stockings.• Sore eyes I may have, but at least I am not blind and can still darn my own stockings.• If it could darn socks, I'd marry it.darndarn4 noun [countable] DCa place where a hole in a piece of clothing has been repaired neatly with woolExamples from the Corpus
darn• I don't give a darn if the results don't coincide with the editorial board's political biases!Origin darn3 (1600-1700) Probably from French darner 