sling: English has at least two distinct words sling, maybe more – the picture is far from clear. The first to appear was the verb, ‘throw’ [13]. This was probably borrowed from Old Norse slyngva, but as it originally meant specifically ‘throw with a sling’ there is clearly some connection with the noun sling ‘strap for throwing stones’ [13], whose immediate source was perhaps Middle Low German slinge. Sling ‘loop or strap for holding things’ [14] may be the same word, although there is no conclusive proof for this. Sling ‘spirit-based drink’ [18] first came on the scene in America, but its origins are unknown.
sling (n.1)
c. 1300, "implement for throwing stones," from an unidentified continental Germanic source (such as Middle Low German slinge "a sling"); see sling (v.). The notion probably is of a sling being twisted and twirled before it is thrown. Sense of "loop for lifting or carrying heavy objects" first recorded early 14c. Meaning "piece of cloth tied around the neck to support an injured arm" is first attested 1720.
sling (v.)
c. 1200, "to knock down" using a sling, later "to throw" (mid-13c.), especially with a sling, from Old Norse slyngva, from Proto-Germanic *slingwanan (cognates: Old High German slingan, German schlingen "to swing to and fro, wind, twist;" Old English slingan "to creep, twist;" Old Frisian slinge, Middle Dutch slinge, Old High German slinga, German Schlinge "sling;" Middle Swedish slonga "noose, knot, snare"), from PIE *slengwh "to slide, make slide; sling, throw." Meaning "to hang from one point to another" (as a hammock) is from 1690s. Related: Slung; slinging.
sling (n.2)
sweetened, flavored liquor drink, 1807, American English, of unknown origin; perhaps literally "to throw back" a drink (see sling (v.)), or from German schlingen "to swallow."