How is “break sweat” used?

In Guardians of the Galaxy Vol. 3 (2023), one line is: “This one has been running for two hours without breaking a sweat”

Which movie is “break sweat” from?

The clip at the top of this page is from Guardians of the Galaxy Vol. 3 (2023).

to use a lot of physical effort

informal · Se oye en 3 películas

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to use a lot of physical effort
Not too much. I wouldn't want you to break a sweat or anything.
This one has been running for two hours without breaking a sweat

Definiciones del Oxford Advanced Learner's Dictionary, 9.ª edición

This one has been running for two hours without breaking a sweat

En 7 películas · n.º 1