Etymology
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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" (from PIE root *sol- "whole, well-kept"). The notion is of important visitors greeted with a volley of gunfire into the air; applied afterward to any concentrated fire from guns.

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Definitions of salvo

salvo (n.)
an outburst resembling the discharge of firearms or the release of bombs;
salvo (n.)
rapid simultaneous discharge of firearms;
Synonyms: fusillade / volley / burst
salvo (n.)
a sudden outburst of cheers;
there was a salvo of approval
From wordnet.princeton.edu