Definition of for all you care or he, she, etc. cares in English:

for all you care (or he, she, etc. cares)

  • informal Used to indicate that someone feels no interest or concern: I could drown for all you care
    More example sentences
    • They could be wearing grass skirts for all you care.
    • It could all be done with elastic bands for all you care.
    • Then wear it with rubber shoes, for all he cares!
See parent entry: care

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tease (someone) playfully