light a fire under (someone)

idiom

Definition of light a fire under (someone) 

US, informal

: to cause (someone) to move or work more quickly and effectively I've never seen him work so hard. Someone must have lit a fire under him.

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Dictionary Entries near light a fire under (someone)

ligger

light

light adaptation

light a fire under (someone)

light air

light airplane

light-armed

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occurring twice a year or every two years

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