Definition of to overstep in English English dictionary
To go too far beyond (a limit); especially, to cross boundaries or exceed norms or conventions
That color scheme really oversteps the bounds of good taste.
If you say that someone oversteps the limits of a system or situation, you mean that they do something that is not allowed or is not acceptable. The Commission is sensitive to accusations that it is overstepping its authority = go beyond If someone oversteps the mark, they behave in a way that is considered unacceptable. He overstepped the mark and we had no option but to suspend him. = go too far
go beyond; "She exceeded our expectations"; "She topped her performance of last year"