Lingo
hair shirt
something extremely hard that one goes through, often as a punishment
The origin of the idiom "hair shirt" can be traced back to religious practices and traditions that date back centuries. The practice of wearing a hair shirt as a form of penance or self-mortification was prevalent in various religious orders, particularly in medieval Christianity. The use of a hair shirt was seen as a way to demonstrate humility, repentance, and spiritual discipline.
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