(EXCEPT) [preposition], [conjunction] - exceptEventually, all but one of them promised to come to his leaving party.He's anything but violent (= not violent in any way).I'd have crashed the car but for your warning.This is the last episode but one (= one before the last) of this drama serial.She's one of those guests who does nothing but complain.This car has been nothing but trouble - it's always breaking down!
BUT
Meaning of BUT in English
Cambridge English vocab. Кембриджский английский словарь. 2012