People who light, set, or discharge fires, or who shoot guns and weapons.
From 'fire' (Old English 'fyr') with the agent suffix '-er' added to indicate 'one who fires,' evolved to mean both those who start fires and those who discharge weapons.
The term 'firer' has been used since the 1600s for soldiers on the front lines—but it could also mean someone deliberately setting fires, which is why context matters when reading historical military documents!
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