The phrase "Fire Away", meaning "Ask me questions", appears to be a metaphor stemming from an old military term involving discharging firearms (source). However, "Away" is generally a directional term, yet in the phrase "Fire away" it seems to mean "at will" or "with abandon". How did it get such an unusual meaning? Was this a sarcastic instruction perhaps?
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I read "fire away" almost the same way that I would "bombs away", as an order to "release" the projectile, not a suggestion for where they can put their projectiles. A longer form might have been "let the fire be away" or "let the fire be on its way". This has the feeling of something that could be an actual order as opposed to an order to whiff, which militaries tend not to do for reasons involving accidental murdering.
Imagine yourself being a Glock 19
and your words (or your questions) are bullets.
Do you want to keep the bullets with yourself, or fire away?
The phrase "Fire Away", meaning to go ahead and "Ask me questions" means to go ahead do your worst