Definition of bumper adjective from the Oxford Advanced American Dictionary

 

bumper

 adjective
adjective
NAmE//ˈbʌmpər//
 
[only before noun](approving)
 
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unusually large; producing an unusually large amount a bumper issue (= of a magazine, etc.) a bumper crop/harvest/season/year
See the Oxford Advanced Learner's Dictionary entry: bumper

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