To begin speaking, asking questions, or taking action; an invitation to proceed without hesitation.
Originally a military command to begin shooting, this phrase dates to the 18th century when coordinated volleys required precise timing. The metaphorical use emerged in the 19th century, transferring the concept of unleashing firepower to unleashing words or actions.
The phrase beautifully demonstrates how military language infiltrates civilian conversation. When someone says 'fire away,' they're unconsciously invoking the imagery of artillery or musket volleys, turning conversation into a kind of verbal warfare.
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