could/couldn't care less
 could/couldn't care less
   informal  
  ◇ If you could care less (US) or couldn't care less, you are not at all concerned about or interested in something.
   I could care less what happens. [=I don't care what happens]
   He says he couldn't care less if he gets fired.
  
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 Main Entry: care
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 could/couldn't care less — see care, 2
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 Main Entry: less