The battle ship fired salvo after salvo into the hills above the beach.
a rapid discharge from multiple guns — as in battle or in a ceremonial salute
a rapid series of points made in a verbal assault
Much more rarely, a salvo can reference a sudden burst of applause or cheers as in "There was a salvo of approval."
Even more rarely, salvo can reference an excuse or something to make someone feel better about their self-image as when Henry Fielding wrote, "Blifil had nothing more to do than to confirm these assertions; which he did with such equivocations, that he preserved a salvo for his conscience; and had the satisfaction of conveying a lie to his uncle, without the guilt of telling one."