overstep (one's)/its mark(redirected from overstepping its mark)
overstep (one's)/its mark
To go further or do more than one should or is permitted to do. I really feel like you overstepped your mark when you started criticizing John's ability as a parent. The city council has overstepped its mark in imposing this steep new income tax on its residents.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.