do (oneself) a mischief

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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.
See also: mischief

do yourself a mischief

INFORMAL
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.
See also: mischief