The Collaborative International Dictionary of English v.0.48:

Jerk \Jerk\ (j[~e]rk), v. t. [Corrupted from Peruv. charqui
   dried beef.]
   To cut into long slices or strips and dry in the sun; as, to
   jerk beef. See Charqui.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Jerk \Jerk\, v. t. [imp. & p. p. Jerked (j[~e]rkt); p. pr. &
   vb. n. Jerking.] [Akin to yerk, and perh. also to yard a
   measure.]
   [1913 Webster]
   1. To beat; to strike. [Obs.] --Florio.
      [1913 Webster]

   2. To give a quick and suddenly arrested thrust, push, pull,
      or twist, to; to yerk; as, to jerk one with the elbow; to
      jerk a coat off.
      [1913 Webster]

   3. To throw with a quick and suddenly arrested motion of the
      hand; as, to jerk a stone.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Jerk \Jerk\, v. i.
   1. To make a sudden motion; to move with a start, or by
      starts. --Milton.
      [1913 Webster]

   2. To flout with contempt.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Jerk \Jerk\, n.
   [1913 Webster]
   1. A short, sudden pull, thrust, push, twitch, jolt, shake,
      or similar motion.
      [1913 Webster]

            His jade gave him a jerk.             --B. Jonson.
      [1913 Webster]

   2. A sudden start or spring.
      [1913 Webster]

            Lobsters . . . swim backwards by jerks or springs.
                                                  --Grew.
      [1913 Webster]

   3. A foolish, stupid, or otherwise contemptible person.
      [Slang]

   Syn: jerkoff.
        [PJC]

   4. (Sport) The lifting of a weight, in a single rapid motion,
      from shoulder height until the arms are outstretched above
      the head; distinguished from press in that the motion in
      a jerk is more rapid, and the body may be moved under the
      weight to assist completion of the movement; as, a clean
      and jerk of two hundred pounds.
      [PJC]

   2. Calisthenic exercises, such as push-ups or deep knee
      bends; also called physical jerks. [British]
      [PJC]

WordNet (r) 3.0 (2006):

jerk
    n 1: a dull stupid fatuous person [syn: jerk, dork]
    2: an abrupt spasmodic movement [syn: jerk, jerking, jolt,
       saccade]
    3: (mechanics) the rate of change of acceleration
    4: meat (especially beef) cut in strips and dried in the sun
       [syn: jerky, jerked meat, jerk]
    5: raising a weight from shoulder height to above the head by
       straightening the arms
    6: a sudden abrupt pull [syn: tug, jerk]
    v 1: pull, or move with a sudden movement; "He turned the handle
         and jerked the door open" [syn: yank, jerk]
    2: move with abrupt, seemingly uncontrolled motions; "The
       patient's legs were jerkings" [syn: jerk, twitch]
    3: make an uncontrolled, short, jerky motion; "his face is
       twitching" [syn: twitch, jerk]
    4: jump vertically, with legs stiff and back arched; "the yung
       filly bucked" [syn: buck, jerk, hitch]
    5: throw or toss with a quick motion; "flick a piece of paper
       across the table"; "jerk his head" [syn: jerk, flick]