American Idioms – Idiom Wizard Lists Over 5,500 Idioms & Slang Descriptions

Light a fire under


Incite. Inspire. Provoke someone into action. Strongly urge someone to do a chore. A fire lit under your butt or feet would surely force you to move and become active, so this phrase indicates a forceful pressure to act.

“Wanting to buy a car has sure lit a fire under him to get a job and earn money.”

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