do someone 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
Farlex Dictionary of Idioms.

do someone (or yourself) a mischief

injure someone or yourself. informal
See also: mischief, someone
Farlex Partner Idioms Dictionary
See also:
  • do (one) a mischief
  • do somebody/yourself a mischief
  • mischief
  • do (oneself) a mischief
  • do yourself a mischief
  • chip
  • chips
  • up on (one's) ear
  • do (oneself or someone) an injury
  • do somebody/yourself an injury