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English definition of “bummer”

bummer

noun [S]     /ˈbʌm.ər/ US  // offensive
something that is very annoying or not convenient : "I've left my wallet at home ." "What a bummer!"US I locked my keys in the car - bummer!Difficult things and peoplePreventing and impeding
(Definition of bummer noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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