Do yourself a mischief Australia British humorous informal
hurt someone or yourself
If you try to carry that suitcase, you’ll do yourself a mischief.
You'll do yourself a mischief if you're not careful with these scissors.
I would have done myself a mischief if I’d carried on wearing this tight T-shirt.
You'll do yourself a mischief if you don't calm yourself down.
Indicates that something which initially seems bad but harmless can become much worse in the future or lead to a harmful development
Starting of the idiom is a verb, we need to conjugate tense for the verb
1. To punch a hole in one's ticket to show that they have paid for a ride
2. To do something that allows one to go further in a competition or to be promoted at work
1. Please, tell me if I forget to punch your ticket.
2. With a view to punching my ticket to the final, I did whatever it takes to win this round.