The Collaborative International Dictionary of English v.0.48:

Shop \Shop\, obs.
   imp. of Shape. Shaped. --Chaucer.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Shop \Shop\, n. [OE. shoppe, schoppe, AS. sceoppa a treasury, a
   storehouse, stall, booth; akin to scypen a shed, LG. schup a
   shed, G. schoppen, schuppen, a shed, a coachhouse, OHG.
   scopf.]
   1. A building or an apartment in which goods, wares, drugs,
      etc., are sold by retail.
      [1913 Webster]

            From shop to shop
            Wandering, and littering with unfolded silks
            The polished counter.                 --Cowper.
      [1913 Webster]

   2. A building in which mechanics or artisans work; as, a shoe
      shop; a car shop.
      [1913 Webster]

            A tailor called me in his shop.       --Shak.
      [1913 Webster]

   3. A person's occupation, business, profession, or the like,
      as a subject of attention, interest, conversation, etc.;
      -- sometimes in deprecation or disapproval; as, to talk
      shop at a party. Also used attributively, as in shop talk.
      [Webster 1913 Suppl. +PJC]

   4. A place where any industry is carried on; as, a chemist's
      shop; also, (Slang), any of the various places of business
      which are commonly called offices, as of a lawyer, doctor,
      broker, etc.
      [Webster 1913 Suppl.]

   5. Any place of resort, as one's house, a restaurant, etc.
      [Slang, Chiefly Eng.]

   6. the group of workers and the activities controlled by an
      administrator; as, to have five people in one's shop.
      [Colloq.]

   Note: Shop is often used adjectively or in composition; as,
         shop rent, or shop-rent; shop thief, or shop-thief;
         shop window, or shop-window, etc.
         [1913 Webster]

   To smell of the shop, to indicate too distinctively one's
      occupation or profession.

   To talk shop, to make one's business the topic of social
      conversation; also, to use the phrases peculiar to one's
      employment. [Colloq.]
      [1913 Webster]

   Syn: Store; warehouse. See Store.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Shop \Shop\, v. i. [imp. & p. p. Shopped; p. pr. & vb. n.
   Shopping.]
   To visit shops for the purpose of purchasing goods.
   [1913 Webster]

         He was engaged with his mother and some ladies to go
         shopping.                                --Byron.
   [1913 Webster]

WordNet (r) 3.0 (2006):

shop
    n 1: a mercantile establishment for the retail sale of goods or
         services; "he bought it at a shop on Cape Cod" [syn:
         shop, store]
    2: small workplace where handcrafts or manufacturing are done
       [syn: workshop, shop]
    3: a course of instruction in a trade (as carpentry or
       electricity); "I built a birdhouse in shop" [syn: shop
       class, shop]
    v 1: do one's shopping; "She goes shopping every Friday"
    2: do one's shopping at; do business with; be a customer or
       client of [syn: patronize, patronise, shop, shop at,
       buy at, frequent, sponsor] [ant: boycott]
    3: shop around; not necessarily buying; "I don't need help, I'm
       just browsing" [syn: shop, browse]
    4: give away information about somebody; "He told on his
       classmate who had cheated on the exam" [syn: denounce,
       tell on, betray, give away, rat, grass, shit,
       shop, snitch, stag]

Moby Thesaurus II by Grady Ward, 1.0:

96 Moby Thesaurus words for "shop":
   agency, atelier, barbershop, beauty parlor, beauty shop, bench,
   betray, booking office, boutique, box office, branch,
   branch office, browse, butcher shop, buy, cabinet, chain store,
   chambers, chancellery, chancery, closet, co-op, company, concern,
   concession, consulate, cooperative, corporate headquarters,
   corporation, countinghouse, country store, den, department store,
   desk, dime store, discount house, discount store, embassy,
   emporium, establishment, executive office, facility, firm,
   five-and-ten, general store, go marketing, go shopping,
   headquarters, home office, house, inform against, inform on,
   installation, institution, legation, loft, look for, magasin,
   mail-order house, main office, market, mart, office, organization,
   outlet, parlor, post, purchase, research, retail store, salon,
   seek, showroom, snitch on, store, studio, study, supermarket,
   sweatshop, ticket office, trading post, variety shop,
   variety store, warehouse, wareroom, wholesale house, window-shop,
   work site, work space, workbench, workhouse, working space,
   workplace, workroom, workshop, worktable