Question

what is meant by light a fire​

Answer 1

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Also, build a fire under. Urge or goad to action, as in If we don't light a fire under that committee, they'll never do any work. This hyperbolic colloquialism uses light in the sense of “ignite,” a usage dating from the mid-1100s.

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Answer 2

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• (third-person singular simple present lights someone's fire, present participle lighting someone's fire, simple past and past participle lit someone's fire).

• To excite, to turn on.