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To talk back to someone in a rude, impertinent, and disrespectful manner. You're going to get suspended again if you keep smarting off to your teachers like that. I heard that the boss fired him because he smarted off during a board meeting.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
To speak or act impertinently: One of my coworkers smarted off to the management and was fired. If you smart off in class, the teacher will punish you.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.