Do a mischief - Idioms by The Free Dictionary
do (one) a mischief (redirected from do a mischief)
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do (one) a mischief
To do something that harms one. Primarily heard in UK, Australia. You sure did your brother a mischief by including him in that dangerous game.
do someone (or yourself) a mischief injure someone or yourself. informal
ˌdo somebody/yourself a ˈmischief (British English, informal or humorous) hurt somebody/yourself: You could do yourself a mischief wearing such tight trousers!