se fondre

to merge into each other

Sur quoi tu te fondes pour dire ça ?	Why would they think that?
Sur quoi tu te fondes pour dire ça ?	Why would you say that?
Sur quoi tu te fondes pour dire ça ?	What ever gave you that idea?
Sur quoi tu te fondes pour dire ça ?	Why do you think that?
Ma dissertation souffre des principes sur lesquels tu te fondes.	I mean, look, you're standing on principle and the result is that the essay suffers.
Sur quoi tu te fondes pour dire ça ?	Why do they think that?

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