float someone's boat

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float someone's boat (third-person singular simple present floats someone's boat, present participle floating someone's boat, simple past and past participle floated someone's boat)

1. (slang) To interest or appeal to someone; to make someone happy.

   I invited Lily to join us, but horror films don't float her boat.

• melt someone's butter, tickle someone's fancy, turn someone's crank, be someone's cup of tea, butter someone's biscuit

• whatever floats your boat