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more fool (one)
An expression mocking a decision or action that one thinks to be particular stupid or foolhardy. If you give money to Jeremy and expect him to pay you back, then more fool you. A: "So, you sold your car and bought a nice bike, but now you're moving to the middle of the countryside?" B: "I know, more fool me."
more fool —used as an exclamation indicating that a specified person is unwise to behave in such a way.
2002 Pride Any self-respecting female should be wise enough to steer clear of Romeo rats and, if you don't, then more fool you.