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 a 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.

The meaning "building or room set aside for sale of merchandise" is from mid-14c. The meaning "schoolroom equipped for teaching vocational arts" is from 1914, American English (as in shop class, attested by 1948).

The sense of "one's own business, craft, or calling" is from 1814, as in talk shop (v.), "converse in general society about matters pertaining to one's trade," which is attested by 1860. Shop-talk (n.) is by 1881.

c. 1300, repairen, "go (to a specified place), arrive, make one's way, betake oneself," from Old French repairer, repairier "to return, come back, to frequent, to return (to one's country)," earlier repadrer, from Late Latin repatriare "return to one's own country" (see repatriate). Related: Repaired; repairing; repairment.

"to mend, put back in order, restore to a sound, good, or complete condition," mid-14c., reparen, from Old French reparer "repair, mend" (12c.) and directly from Latin reparare "restore, put back in order," from re- "again" (see re-) + parare "make ready, prepare" (from PIE root *pere- (1) "to produce, procure").

The sense of "make amends for injury by an equivalent, make good" is by 1560s. Related: Repaired; repairing.

c. 1400, repaire, "maintenance, restoration;" 1590s, "act of restoring, restoration to a sound or good state after decay," from repair (v.1). Meaning "state or condition in respect to reparation" is from c. 1600, especially "good or sound condition kept up by repairing as needed." Repair-shop attested by 1877.

early 14c., "act of betaking (oneself) to a (specific) place," from repair (v.2). Sense of "place to which one repairs, a haunt or resort" is from late 14c.

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.

emporium for stoner gear, by 1969 (noted in 1966 as the name of a specific shop in New York City selling psychedelic stuff), from head (n.) in the drug sense.

1800, "marine shop," from junk (n.1) in the sense "discarded articles from ships." By 1951 in the non-marine sense "junk-dealer."

"somewhat shabby from handling while on display," by 1811, from shop (n.) + worn (adj.). Shop-soiled in the same sense is by 1862. An earlier nonce-use was shop-rid (1610s), based on bed-rid.

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