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. © 2015 Farlex, Inc, all rights reserved.

do someone (or yourself) a mischief

injure someone or yourself. informal
See also: mischief, someone
Farlex Partner Idioms Dictionary © Farlex 2017
See also: