snow (n.)

Middle English snou, from Old English snaw "snow, that which falls as snow; a fall of snow; a snowstorm," from Proto-Germanic *snaiwaz (source also of Old Saxon and Old High German sneo, Old Frisian and Middle Low German sne, Middle Dutch snee, Dutch sneeuw, German Schnee, Old Norse snjor, Gothic snaiws "snow"), from PIE root *sniegwh- "snow; to snow" (source also of Greek nipha, Latin nix (genitive nivis), Old Irish snechta, Irish sneachd, Welsh nyf, Lithuanian sniegas, Old Prussian snaygis, Old Church Slavonic snegu, Russian snieg', Slovak sneh "snow"). The cognate in Sanskrit, snihyati, came to mean "he gets wet."

As slang for "cocaine" it is attested from 1914.

c. 1300, snouen, "to fall as snow," from the noun, replacing Old English sniwan, which would have yielded modern snew (which lingered as a parallel form until 17c., longer in Yorkshire), from the Proto-Germanic source of snow (n.). The Old English verb is cognate with Middle Dutch sneuuwen, Dutch sneeuwen, Old Norse snjova, Swedish snöga.

Also þikke as snow þat snew,

Or al so hail þat stormes blew.

[Robert Mannyng of Brunne, transl. Wace's "Chronicle," c. 1330]

The transitive sense of "cause to snow" is by mid-14c. The figurative sense of "overwhelm; surround, cover, and imprison" (as heavy snows can bury livestock in the field) is 1880, American English, in phrase to snow (someone) under. Snow job "strong, persistent persuasion in a cause known to be dubious" (1943) is World War II armed forces slang, probably from the same image.