light a fire under someone idiom
mainly US使（某人）加快，加强（尤指在过去行动迟缓的情况下）
to make someone act quickly or forcefully, especially someone who has not been doing enough before
The coach tried to light a fire under the team in his halftime speech. 教练试图在半场休息时鼓励队员们振奋起来。
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