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salvo [salvo 词源字典]: salvo: [16] When English originally acquired the word salvo, it was in the forms salve or salva, which came respectively from French salve and its source, Italian salva. This originally meant ‘salute, greeting’ (it came from salvē ‘hail’, the imperative form of Latin salvēre ‘be in good health’, which is related to English safe, salubrious, salute, save, etc).

Important personages being greeted with a volley of gunfire, salva soon came to be used for such a discharge of guns (the related English salute has developed along the same lines – as in a ‘21-gun salute’). The form salvo, which emerged in the 17th century, is an alteration of salva.
=> safe, salute, save[salvo etymology, salvo origin, 英语词源]
blizzard (n.): "strong, sustained snowstorm," 1859, origin obscure (perhaps somehow connected with blaze (n.1)); it came into general use in the U.S. in this sense in the hard winter 1880-81. OED says it probably is "more or less onomatopœic," and adds "there is nothing to indicate a French origin." Before that it typically meant "violent blow," also "hail of gunfire" in American English from 1829, and blizz "violent rainstorm" is attested from 1770. The winter storm sense perhaps is originally a colloquial figurative use in the Upper Midwest of the U.S.
rake (v.): mid-13c., "clear (rubbish, grass, etc.) by raking; gather (grain) by raking," from rake (n.1), or from a lost Old English verb related to it, or from a similar Scandinavian source (compare Swedish raka, Danish rage "rake"). Of gunfire from 1630s. Related: Raked; raking. To rake in money or something like it is from 1580s.
salvo (n.): 1719, alteration of salva (1590s) "simultaneous discharge of guns," from Italian salva "salute, volley" (French salve, 16c., is from Italian), from Latin salve "hail!," literally "be in good health!," the usual Roman greeting, regarded as imperative of salvere "to be in good health," but properly vocative of salvus "healthy" (see safe (adj.)). The notion is of important visitors greeted with a volley of gunfire into the air; applied afterward to any concentrated fire from guns.
rat-tat: "A rapping sound (used especially in reference to a sequence of knocks on a door or the sound of gunfire)", Late 17th century: imitative.