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1 VERB If you bump into something or someone, you accidentally hit them while you are moving. □ [V + into/against ] They stopped walking and he almost bumped into them. □ [V n] He bumped his head on the low beams of the house. ● N‑COUNT Bump is also a noun. □  Small children often cry after a minor bump.

2 N‑COUNT A bump is the action or the dull sound of two heavy objects hitting each other. □  I felt a little bump and I knew instantly what had happened. □  The child took five steps, and then sat down with a bump.

3 N‑COUNT A bump is a minor injury or swelling that you get if you bump into something or if something hits you. □ [+ on ] She fell against our coffee table and got a large bump on her forehead.

4 N‑COUNT If you have a bump while you are driving a car, you have a minor accident in which you hit something. [INFORMAL ]

5 N‑COUNT A bump on a road is a raised, uneven part. □  The truck hit a bump and bounced.

6 VERB If a vehicle bumps over a surface, it travels in a rough, bouncing way because the surface is very uneven. □ [V prep/adv] We left the road, and again bumped over the mountainside.

7 → see also goose bumps

8 PHRASE If someone comes down to earth with a bump , they suddenly start recognizing unpleasant facts after a period of time when they have not been doing this. [EMPHASIS ] □ [+ after ] We were brought back to earth with a bump by financial reality.

▸  bump into PHRASAL VERB If you bump into someone you know, you meet them unexpectedly. [INFORMAL ] □ [V P n] I happened to bump into Mervyn Johns in the hallway.

▸  bump off PHRASAL VERB To bump someone off means to kill them. [often HUMOROUS , INFORMAL ] □ [V n P ] They will probably bump you off anyway! □ [V P n] …a vigilante killer who is bumping off criminals.

bump|er /bʌ mpə ^r / (bumpers )

1 N‑COUNT Bumpers are bars at the front and back of a vehicle which protect it if it bumps into something.

2 ADJ [ADJ n] A bumper crop or harvest is one that is larger than usual. □  …a bumper crop of rice. □  In the state of Iowa, it's been a bumper year for corn.

3 ADJ [ADJ n] If you say that something is bumper size, you mean that it is very large. □  …bumper profits. □  …a bumper pack of matches.

bu mp|er car (bumper cars ) N‑COUNT A bumper car is a small electric car with a wide rubber bumper all round. People drive bumper cars around a special enclosure at a fairground.

bu mp|er stick|er (bumper stickers ) N‑COUNT A bumper sticker is a small piece of paper or plastic with words or pictures on it, designed for sticking onto the back of your car. It usually has a political, religious, or humorous message. □  …a bumper sticker that said, 'Happiness Is Being a Grandmother'.

bumph /bʌ mf/ → see bumf

bump|kin /bʌ mpk I n/ (bumpkins ) N‑COUNT If you refer to someone as a bumpkin , you think they are uneducated and stupid because they come from the countryside. [DISAPPROVAL ] □  …unsophisticated country bumpkins.

bump|tious /bʌ mpʃəs/ ADJ If you say that someone is bumptious , you are criticizing them because they are very pleased with themselves and their opinions. [DISAPPROVAL ] □  …a bumptious bureaucrat.

bumpy /bʌ mpi/ (bumpier , bumpiest )

1 ADJ A bumpy road or path has a lot of bumps on it. □  …bumpy cobbled streets.

2 ADJ A bumpy journey is uncomfortable and rough, usually because you are travelling over an uneven surface. □  …a hot and bumpy ride across the desert.

bun /bʌ n/ (buns )

1 N‑COUNT [oft n N ] Buns are small bread rolls. They are sometimes sweet and may contain dried fruit or spices. □  …a currant bun.

2 N‑COUNT Buns are small sweet cakes. They often have icing on the top. [BRIT ]

3 N‑COUNT If a woman has her hair in a bun , she has fastened it tightly on top of her head or at the back of her head in the shape of a ball.