play around

play around idiom
Act playfully or irresponsibly, especially in having a casual or extramarital sexual relationship. For example, She got tired of his playing around and filed for divorce. [1920s]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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