light a fire under
/L AY1 T AH0 F AY0 ER0 AH0 N D ER0/verb
- 1
To motivate or encourage (someone) to start sooner or move faster.
“Let me see if I can light a fire under the waiter to get our order sooner.”
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Source: https://en.wiktionary.org/wiki/light%20a%20fire%20under