do (yourself) a mischief

British & Australian, humorous

if you tell someone they will do themselves a mischief if they do something, you mean they will hurt themselves.

You want to be careful jumping over spikes like that - you might do yourself a mischief!

• have pins and needles
• have pity on
• have pity on someone
• have pride of place
• have rolling in the aisles
• have second thoughts
• have seen better days
• have seen more something than has had hot dinners
• have seen more something than someone has had hot dinners
• have seen more than has had hot dinners
• have seen more than someone has had hot dinners
• have seen the last of
• have seen the last of someone
• have seen the last of something
• have several strings to bow
• have several strings to your bow
• have share of
• have share of something
• have shit for brains
• have sights set on
• have sights set on doing something
• have sights set on something
• have someone by the balls
• have someone by the short and curlies
• have someone dead to rights