The Collaborative International Dictionary of English v.0.48:

Bump \Bump\, v. i. [See Boom to roar.]
   To make a loud, heavy, or hollow noise, as the bittern; to
   boom.
   [1913 Webster]

         As a bittern bumps within a reed.        --Dryden.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Bump \Bump\, n.
   The noise made by the bittern.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Bump \Bump\ (b[u^]mp; 215), v. t. [imp. & p. p. Bumped
   (b[u^]mpt); p. pr. & vb. n. Bumping.] [Cf. W. pwmp round
   mass, pwmpiaw to thump, bang, and E. bum, v. i., boom to
   roar.]
   To strike, as with or against anything large or solid; to
   thump; as, to bump the head against a wall.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Bump \Bump\, v. i.
   To come in violent contact with something; to thump. "Bumping
   and jumping." --Southey.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Bump \Bump\, n. [From Bump to strike, to thump.]
   1. A thump; a heavy blow.
      [1913 Webster]

   2. A swelling or prominence, resulting from a bump or blow; a
      protuberance.
      [1913 Webster]

            It had upon its brow
            A bump as big as a young cockerel's stone. --Shak.
      [1913 Webster]

   3. (Phren.) One of the protuberances on the cranium which are
      associated with distinct faculties or affections of the
      mind; as, the bump of "veneration;" the bump of
      "acquisitiveness." [Colloq.]
      [1913 Webster]

   4. The act of striking the stern of the boat in advance with
      the prow of the boat following. [Eng.]
      [1913 Webster]

WordNet (r) 3.0 (2006):

bump
    n 1: a lump on the body caused by a blow
    2: something that bulges out or is protuberant or projects from
       its surroundings; "the gun in his pocket made an obvious
       bulge"; "the hump of a camel"; "he stood on the rocky
       prominence"; "the occipital protuberance was well developed";
       "the bony excrescence between its horns" [syn: bulge,
       bump, hump, swelling, gibbosity, gibbousness,
       jut, prominence, protuberance, protrusion,
       extrusion, excrescence]
    3: an impact (as from a collision); "the bump threw him off the
       bicycle" [syn: blow, bump]
    v 1: knock against with force or violence; "My car bumped into
         the tree" [syn: bump, knock]
    2: come upon, as if by accident; meet with; "We find this idea
       in Plato"; "I happened upon the most wonderful bakery not
       very far from here"; "She chanced upon an interesting book in
       the bookstore the other day" [syn: find, happen,
       chance, bump, encounter]
    3: dance erotically or dance with the pelvis thrust forward;
       "bump and grind"
    4: assign to a lower position; reduce in rank; "She was demoted
       because she always speaks up"; "He was broken down to
       Sergeant" [syn: demote, bump, relegate, break, kick
       downstairs] [ant: advance, elevate, kick upstairs,
       promote, raise, upgrade]
    5: remove or force from a position of dwelling previously
       occupied; "The new employee dislodged her by moving into her
       office space" [syn: dislodge, bump]

The Free On-line Dictionary of Computing (19 January 2023):

bump

   Increment.  E.g. C's ++ operator.  It is used especially of
   counter variables, pointers and index dummies in "for",
   "while", and "do-while" loops.

   (1994-11-29)


The Jargon File (version 4.4.7, 29 Dec 2003):

bump
 vt.

    Synonym for increment. Has the same meaning as C's ++ operator. Used esp.
    of counter variables, pointers, and index dummies in for, while, and
    do-while loops.