Overstep the mark/line British American phrase
In this expression, the 'mark' may be the line behind which runners stand prior to the race. Alternatively, when a line was drawn in the ground that neither boxer was able to cross, it may refer to boxing matches in the past.
To go further or do more than what is allowed
She will lose her temper, if you overstep the mark.
I shouldn't have overstepped the line, so I hadn't been punished
It is often used in all of tenses.
There is no clear information about the origin of this expression.
Daughter: So I really want all my friends to have a great time. I was thinking it would be a good idea to have some candy out on the tables for people to snack on.
Mother: Well, if you want them to really enjoy themselves, candy is dandy but liquor is quicker.