curse!, especially as “confound it!”, “confound you!”, etc; used for mild oaths or imprecations UK
SERGEANT: Oh, don’t misunderstand me, sir. I’m willing enough to try, but you see, ah... we’re not used to pulling officers out of pits. ALGERNON: Confound it, man, what are you jabbering about? — The Highlanders, 24 December 1966