(US, nonstandard, proscribed) To not care at all; to have no concern or interest; to be apathetic.
Farmers knew that dead fish made plants go better. They could care less about why that happened. Scientists could not sleep until they found out why.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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