beef up

beef up idiom
Strengthen, reinforce, as in Mary wants us to beef up her part in the play. This phrase relies on an older slang sense of beef as “muscles” or “power.” [Colloquial; late 1800s]

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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