v. To relegate (something, especially a topic or a group of people,) to the margins or to a lower limit
The Century Dictionary and Cyclopedia
To furnish with marginal notes.
To make marginal notes.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
v. relegate to a lower or outer edge, as of specific groups of people
Word Usage
"* Good luck with this one: Grover Norquist says the GOP needs to "marginalize" Islamophobia among right-wingers and "make it clear that there's no place for that in the party of Reagan.""