this post was submitted on 31 Aug 2023
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[–] [email protected] 2 points 1 year ago* (last edited 1 year ago)

Its technical meaning is:

a series of shots by an artillery battery with each gun firing one round in turn after a prescribed interval

But derived from that is its common usage outside of military contexts. Particularly in the phrase "opening salvo", which means:

the first in a series of questions, statements etc that you use to try to win an argument

It's that usage which is being used here, only not necessarily with the "opening" part.