It is an instruction, usually by the Captain, to take all of the information that has been generated by the Fire Control team (TMA, paper plot, time/frequency plot, etc) as to the whereabouts of the target, sent it to the weapon (torpedo), and then to fire the torpedo. Hopefully the weapon and the target will arrive at the same place at the same time.
It is usually preceed by the captain checking with each of the critical stations (Ship Control, Fire Control and Weapons Control) to make sure they are each happy with the situation. If so, it's "Match generated bearings and shoot"... shortly followed by a loud BOOM!
JCC
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