What is the definition of Arising Weapon?

An 'arising weapon' is basically a weapon that's just about to come out of nowhere, like when your alarm clock goes off but you've forgotten to turn it off - only instead of waking you up, it launches your prized possessions or worse, your sanity.

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Now, here's an unsettling example sentence: "The politician's 'arising weapon' was a carefully rehearsed joke at a town hall meeting that went so wrong, it left everyone scratching their heads and wondering if they just witnessed a nuclear meltdown or a prank gone horribly wrong."