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Commonly refers to the ability of someone or something to perform well for the first time under pressure, like the common phrase sink or swim. Can also refer to a firefighter attacking his first blaze, a right of passage in most fire departments.
It’s been a Trial by Fire today for the rookie, he’s answered 13 calls before noon!
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by VentMaster July 11, 2018
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To Make Someone's life fucking miserable during a shitty state, in order to shake them into submission.
Bob: "Man, Steve is scared of the pool."

Phil: "Trial by fire, push him in the shallow end."
by Crafty July 12, 2018
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