to a man

to a man idiom
Unanimously, without exception, as in The committee voted against the proposal to a man. This expression, first recorded in 1712, uses man in the sense of “everyone.” It continues to be so used despite its sexist tone. To a woman is very occasionally used for unanimous actions in groups that include only women. Also see as one; with one voice.

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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