to jump at

jump \jump\, v. i. [imp. & p. p. {jumped} (j[u^]mt; 215); p. pr.
   & vb. n. {jumping}.] [Akin to OD. gumpen, dial. G. gumpen,
   jumpen.]
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   1. To spring free from the ground by the muscular action of
      the feet and legs; to project one's self through the air;
      to spring; to bound; to leap.
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            Not the worst of the three but jumps twelve foot and
            a half by the square.                 --Shak.
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   2. To move as if by jumping; to bounce; to jolt. "The jumping
      chariots." --Nahum iii. 2.
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            A flock of geese jump down together.  --Dryden.
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   3. To coincide; to agree; to accord; to tally; -- followed by
      with. "It jumps with my humor." --Shak.
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   {To jump at}, to spring to; hence, fig., to accept suddenly
      or eagerly; as, a fish jumps at a bait; to jump at a
      chance.
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