"paralysis of both arms and legs," 1895, a medical hybrid coined from Latin-based quadri- "four" + -plegia, as in paraplegia, which is ultimately from Greek plege "stroke," from root of plēssein "to strike" (from PIE root *plak- (2) "to strike"). A correct, all-Greek formation would be *tetraplegia.
c. 1300, "act of breaking, forcible disruption or separation," from break (v.). The sense in break of day "first appearance of light in the morning" is from 1580s; the meaning "sudden, marked transition from one course, place, or state to another" is by 1725.
The sense of "short interval between spells of work" (originally between lessons at school) is from 1861. The meaning "stroke of luck" is attested by 1911, probably an image from billiards (where the break that scatters the ordered balls and starts the game is attested from 1865). The meaning "stroke of mercy" is from 1914. The jazz musical sense of "improvised passage, solo" is from 1920s. The broadcasting sense is by 1941.
1540s, "a blow, stroke," from swoop (v.). Meaning "the sudden pouncing of a rapacious bird on its prey" is 1605, from Shakespeare:
Oh, Hell-Kite! All? What, All my pretty Chickens, and their Damme, At one fell swoope? ["Macbeth," IV.iii.219]
1640s, "a show of endearment, display of regard," from French caresse (16c.), a back-formation from caresser or else from Italian carezza "endearment," from caro "dear," from Latin carus "dear, costly, beloved" (from PIE root *ka- "to like, desire"). The meaning "affectionate stroke" is attested in English from 1650s. Related to charity, cherish.
"to stroke beaks," as doves do, hence, of lovers, "caress fondly," 1590s, from bill (n.2)). Paired with coo at least since 1764; Century Dictionary  defines bill and coo (by 1768) as "to kiss and caress and talk nonsense, as lovers." Related: Billed; billing.
"piece of turf or sod with the grass growing on it," used for roofing material, etc., 1530s, Scottish, of unknown origin. Also divet, diffat, devot, etc. The golfing sense "slice of turf cut out by the club in playing a stroke" is by 1884.
c. 1400, "a blow, stroke," perhaps originally imitative of the sound. Meaning "light tap with hand" is from c. 1804. Sense of "that which is formed by patting" (as in pat of butter) is 1754, probably from the verb. Pat on the back in the figurative sense "gesture or expression of encouragement, sympathy, etc." is attested by 1804.
mid-15c. as the name of an agricultural occupation, "one who cuts and dries grass" (hay-making is attested from c. 1400); 1910 in the sense of "very strong blow with the fist," from hay + agent noun of make; the punch probably so called for resemblance to the wide swinging stroke of a scythe. Haymaker punch attested from 1907.
"to strike with a sharp sound," late 15c., echoic. Earlier (c. 1400) as a noun meaning "abrupt stroke." Especially "to chip or break by a sharp blow" (1530s), the sense shifting from the sound to the act that makes it. Especially of the method of sharpening flints from 1862. Related: Knapped; knapper; knapping. For pronunciation, see kn-.