v. To go too far beyond (a limit); especially, to cross boundaries or exceed norms or conventions.
the GNU version of the Collaborative International Dictionary of English
v. To step over or beyond; to transgress.
The Century Dictionary and Cyclopedia
To step over or beyond; exceed.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
v. pass beyond (limits or boundaries)
v. be superior or better than some standard
Word Usage
"Ms. Bysiewicz ordered polls to stay open—which some called an overstep of her authority—and called the election for Mr. Malloy, a fellow Democrat, before all the votes were tallied."