Meaning of BUMPER in English
I. bump ‧ er 1 /ˈbʌmpə $ -ər/ BrE AmE noun [countable]
1 . British English a bar fixed on the front and back of a car to protect it if it hits anything SYN fender American English
2 . bumper-to-bumper bumper-to-bumper traffic is very close together and moving slowly
II. bumper 2 BrE AmE adjective [only before noun]
We hope readers will enjoy this bumper issue of ‘Homes and Gardens’.
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012