flex one's muscles

flex one's muscles idiom
Show off one's strength or power, as in The boys love flexing their muscles, or The new department head has decided to flex her muscles. [Early 1900s]

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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