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.]
   [1913 Webster]
   1. To strike or stab with a pointed instrument. --L'Estrange.
      [1913 Webster]

   2. To thrust in, as a pointed instrument. --Moxon.
      [1913 Webster]

   3. To do or cause to be done by separate portions or lots; to
      sublet (work); as, to job a contract.
      [1913 Webster]

   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.
      [1913 Webster]

   5. To hire or let by the job or for a period of service; as,
      to job a carriage. --Thackeray.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Jobbing \Job"bing\, a.
   1. Doing chance work or odd jobs; as, a jobbing carpenter.
      [1913 Webster]

   2. Using opportunities of public service for private gain;
      as, a jobbing politician. --London Sat. Rev.
      [1913 Webster]

   Jobbing house, a mercantile establishment which buys from
      importers, wholesalers or manufacturers, and sells to
      retailers. [U.S.]
      [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

51 Moby Thesaurus words for "jobbing":
   Machiavellianism, Machiavellism, agency, barter, bartering,
   brokerage, buying and selling, consumer preference study,
   consumer research, consumer survey, dealing, diplomacy,
   diplomatics, direct-mail selling, doing business, exchange,
   give-and-take, hard sell, hawking, high-pressure salesmanship,
   horse trading, huckstering, interchange, jobbery, legal bucketing,
   low-pressure salesmanship, mail-order selling, market research,
   marketing, marketing research, merchandising, peddling, politics,
   promotion, retailing, sales campaign, sales promotion,
   salesmanship, selling, sellout, soft sell, stockbrokerage,
   stockbroking, stockjobbery, stockjobbing, swapping, trade, trading,
   trafficking, wheeling and dealing, wholesaling