The Collaborative International Dictionary of English v.0.48:

Job \Job\ (j[o^]b), v. t. [imp. & p. p. Jobbed (j[o^]bd); p.
   pr. & vb. n. Jobbing.]
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   1. To strike or stab with a pointed instrument. --L'Estrange.
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   2. To thrust in, as a pointed instrument. --Moxon.
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   3. To do or cause to be done by separate portions or lots; to
      sublet (work); as, to job a contract.
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   4. (Com.) To buy and sell, as a broker; to purchase of
      importers or manufacturers for the purpose of selling to
      retailers; as, to job goods.
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   5. To hire or let by the job or for a period of service; as,
      to job a carriage. --Thackeray.
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The Collaborative International Dictionary of English v.0.48:

Jobbing \Job"bing\, a.
   1. Doing chance work or odd jobs; as, a jobbing carpenter.
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   2. Using opportunities of public service for private gain;
      as, a jobbing politician. --London Sat. Rev.
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   Jobbing house, a mercantile establishment which buys from
      importers, wholesalers or manufacturers, and sells to
      retailers. [U.S.]
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