double standard

double standard idiom
A set of principles establishing different provisions for one group than another; also, specifically, allowing men more sexual freedom than women. For example, She complained that her father had a double standard—her brothers were allowed to date, but she was not, even though she was older. [Mid-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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