/ ˈbʌmpə(r); NAmE / noun , adjective
■ noun
a bar fixed to the front and back of a car, etc. to reduce the effect if it hits anything :
a bumper sticker (= a sign that people stick on the bumper of their cars with a message on it)
The cars were bumper to bumper on the road to the coast (= so close that their bumpers were nearly touching) .
—picture at hatchback
■ adjective
[ only before noun ] ( approving ) unusually large; producing an unusually large amount :
a bumper issue (= of a magazine, etc.)
a bumper crop / harvest / season / year