left wing

left wing idiom
The liberal or radical faction of a political group, as in Many consider him a leader of the Democratic Party's left wing. This expression originated in the seating practice of European legislatures, whereby those holding liberal views were assigned to the left side of the house. [First half of 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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