play second fiddle

play second fiddle idiom
Assume a subsidiary role to someone, as in Mary resented always playing second fiddle to her older sister. This term alludes to the part of second violin in an orchestra. Although many would argue it is as important as first violin, it is the idea of subordinacy that was transferred in the figurative term, so used since about 1800.

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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