bump /ˈbʌmp/
  撞擊,腫塊(vt.)碰撞(vi.)撞,顛簸而行
  bump
  塊形
  Bump v. t. [imp. & p. p. Bumped p. pr. & vb. n. Bumping.]  To strike, as with or against anything large or solid; to thump; as, to bump the head against a wall.
  Bump, v. i. To come in violent contact with something; to thump. “Bumping and jumping.”
  Bump n.
  1. A thump; a heavy blow.
  2. A swelling or prominence, resulting from a bump or blow; a protuberance.
  It had upon its brow
  A bump as big as a young cockerel's stone.   --Shak.
  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.]
  4. The act of striking the stern of the boat in advance with the prow of the boat following. [Eng.]
  Bump, v. i.  To make a loud, heavy, or hollow noise, as the bittern; to boom.
     As a bittern bumps within a reed.   --Dryden.
  Bump, n. The noise made by the bittern.
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  bump
       n 1: a lump on the body caused by a blow
       2: something that bulges out or is protuberant or projects from
          a form [syn: bulge, hump, gibbosity, gibbousness,
          jut, prominence, protuberance, protrusion, extrusion,
           excrescence]
       3: an impact (as from a collision); "the bump threw him off the
          bicycle" [syn: blow]
       v 1: knock against with force or violence; "My car bumped into
            the tree" [syn: 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,
           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
          Sargeant" [syn: demote, relegate, break, kick
          downstairs] [ant: promote]
       5: remove or force from a position of dwelling previously
          occupied; "The new employee dislodged her by moving into
          her office space" [syn: dislodge, displace]