Definition of salvo noun from the Oxford Advanced Learner's Dictionary

 

salvo

 noun
noun
BrE BrE//ˈsælvəʊ//
 
; NAmE NAmE//ˈsælvoʊ//
 
(pl. salvos, salvoes)
 
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the act of firing several guns or dropping several bombs, etc. at the same time; a sudden attack The first salvo exploded a short distance away. (figurative) The newspaper article was the opening salvo in what proved to be a long battle. Word Origin late 16th cent. (earlier as salve): from French salve, Italian salva ‘salutation’.
See the Oxford Advanced American Dictionary entry: salvo