mischief(redirected from mischiefs)
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do (oneself) a mischief
To do something that harms oneself. Primarily heard in UK, Australia. I think you'll do yourself a mischief if you try that risky skateboard trick.
to cause trouble. Bob loves to make mischief and get other people into trouble. Don't believe what Mary says. She's just trying to make mischief.
Cause trouble, as in Don't listen to her gossip-she's just trying to make mischief. This idiom was first recorded in 1884, but the related noun mischief-maker, a person who causes trouble especially by tale-bearing, dates from about 1700.
do yourself a mischiefINFORMAL
If you do yourself a mischief, you injure part of your body. I think I'd do myself a mischief if I tried to copy any of her dance moves.