Etymology
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shop (n.)
c. 1300, "booth or shed for trade or work," perhaps from Old English scoppa, a rare word of uncertain meaning, apparently related to scypen "cowshed," from Proto-Germanic *skoppan "small additional structure" (source also of Old High German scopf "building without walls, porch," German dialectal Scopf "porch, cart-shed, barn," German Schuppen "a shed"), from root *skupp-. Or the Middle English word was acquired from Old French eschoppe "booth, stall" (Modern French échoppe), which is a Germanic loan-word from the same root.

Meaning "building or room set aside for sale of merchandise" is from mid-14c. Meaning "schoolroom equipped for teaching vocational arts" is from 1914, American English. Sense of "matters pertaining to one's trade" is from 1814 (as in talk shop (v.), 1860).
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shop (v.)

1680s, "to bring something to a shop, to expose for sale," from shop (n.). The meaning "to visit shops for the purpose of examining or purchasing goods" is first attested 1764. Related: Shopped; shopping. Shop around "seek alternatives before choosing" is from 1922. Shopping cart is recorded from 1956; shopping list is attested by 1913; transferred and figurative use is from 1959.

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shop-worn (adj.)
"shabby from handling while on display," 1838, from shop (n.) + worn (adj.).
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machine-shop (n.)

"workshop in which machines or parts of machines are made and repaired," 1827, from machine (n.) + shop (n.).

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barber-shop (n.)
1570s, from barber + shop (n.). Earlier in same sense was barbery (c. 1500). Barber-shop in reference to close harmony male vocal quartets, it is attested from 1910; the custom of barber's keeping a musical instrument in their shops so waiting customers could entertain themselves is an old one, but the musical product formerly had a low reputation and barber's music (c. 1660) was "wretched, poorly performed music."
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shoplifter (n.)
1670s, from shop (n.) + agent noun of lift (v.). Also in same sense shop-lift (1670s); shop-thief.
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