What does "powerhouse" mean? Is it used commonly to people?
A "powerhouse" is a person or thing that has great power, strength, or energy. When the speaker says that Chadwick is a "powerhouse," it means that he has a powerful acting ability. You can also use this to describe non-human things, like countries or companies. Ex: Meryl Streep is an acting powerhouse. Ex: Germany is famous for being an industrial powerhouse. Ex: My father's company is a powerhouse in the manufacturing industry.
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