do somebody/yourself a mischief

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.
See also: mischief

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
Farlex Dictionary of Idioms.

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
Collins COBUILD Idioms Dictionary, 3rd ed.

ˌdo somebody/yourself a ˈmischief

(British English, informal or humorous) hurt somebody/yourself: You could do yourself a mischief wearing such tight trousers!
See also: mischief, somebody
Farlex Partner Idioms Dictionary
See also:
  • do (one) a mischief
  • do someone a mischief
  • mischief
  • do yourself a mischief
  • do (oneself) a mischief
  • chip
  • chips
  • up on (one's) ear
  • do (oneself or someone) an injury
  • do somebody/yourself an injury