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trifle with (someone or something)
To treat or deal with someone or something in a frivolous or disrespectful manner. Often used in passive constructions. You can't just go through life trifling with people and their affections without any regard for their wellbeing. I wouldn't do that if I were you—the plans of the boss are not to be trifled with.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
trifle with someone or something
to act without seriousness or respect toward someone or something. Don't talk that way to me! I am not to be trifled with. I wish that Ann wouldn't trifle with our efforts at reform.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
To play or toy with someone or something: Don't trifle with my affections. My strict boss is not someone to be trifled with.
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.