Etymology
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hair-shirt (n.)

garment of ascetics and penitents, 1680s, from hair + shirt. Figurative use by 1884. Earlier, such a garment was called simply a hair (c. 1200); and compare haircloth.

updated on October 10, 2017

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Definitions of hair-shirt from WordNet

hair-shirt (adj.)
self-sacrificing or austere;
Synonyms: hair-shirted
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.