To decide to stop an activity, relationship, or endeavor, usually after recognizing it's not working or worth continuing. It means to formally end something that has been ongoing.
This phrase emerged in the late 19th century American English, with 'quits' meaning 'even' or 'settled' (as in debts). The expression originally meant to declare that accounts were settled and both parties could walk away without owing anything to each other.
The phrase provides a psychologically gentle way to acknowledge defeat or ending without assigning blame. It's interesting that we use a financial metaphor (being 'quits' or even) to describe emotional or personal endings, perhaps because it feels more objective and less painful than admitting failure.
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