mend (a hole in knitted material) by interweaving yarn with a needle

I don't expect you to darn my socks

used to emphasize something, especially to express anger or frustration

he was a darn sight younger than Jill

the darn things were expensive

winning it didn't mean a darned thing

you're darn right it's up to me!

used in various expressions for emphasis or to express anger or frustration

darn it all, Poppa!