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bump (n.)

1590s, "protuberance caused by a blow;" 1610s as "a dull-sounding, solid blow;" see bump (v.). The dancer's bump and grind attested from 1940. To be like a bump on a log "silent, stupidly inarticulate" is by 1863, American English.

bump (v.)

1560s, "to bulge out;" 1610s, "to strike heavily, cause to come into violent contact," perhaps from Scandinavian, probably echoic, if the original sense was "hitting" then of "swelling from being hit." It also has a long association with the obsolete verb bum "make a booming noise." To bump into "meet by chance" is from 1886; to bump off "kill" is by 1908 in underworld slang. Related: Bumped; bumping. Bumpsy (adj.) was old slang for "drunk" (1610s).

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Definitions of bump
1
bump (v.)
knock against with force or violence;
My car bumped into the tree
Synonyms: knock
bump (v.)
come upon, as if by accident; meet with;
Synonyms: find / happen / chance / encounter
bump (v.)
dance erotically or dance with the pelvis thrust forward;
bump and grind
bump (v.)
assign to a lower position; reduce in rank;
Synonyms: demote / relegate / break / kick downstairs
bump (v.)
remove or force from a position of dwelling previously occupied;
Synonyms: dislodge
2
bump (n.)
a lump on the body caused by a blow;
bump (n.)
something that bulges out or is protuberant or projects from its surroundings;
Synonyms: bulge / hump / swelling / gibbosity / gibbousness / jut / prominence / protuberance / protrusion / extrusion / excrescence
bump (n.)
an impact (as from a collision);
the bump threw him off the bicycle
Synonyms: blow
From wordnet.princeton.edu