speak up for
speak up for (one)
To testify, argue, or give defense on behalf of one. Thank you for speaking up for me back there. I think the boss was ready to fire me! Our organization's goal is to speak up for the disenfranchised groups of the country.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
speak up for someone or something
to speak in favor of someone or something. If anybody says bad things about me, I hope you speak up for me. I want to speak up for the rights of students.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.