hair shirt

hair shirt idiom
A self-imposed punishment or penance, as in I apologized a dozen times—do you want me to wear a hair shirt forever? This term, mentioned from the 13th century on, alludes to wearing a coarse, scratchy hair shirt, the practice of religious ascetics. Its figurative use dates from the mid-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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