Also means
beat up (slang)
Usage Note
dérouiller literally means to remove rust (rouille) from something. In everyday speech it means to get back in shape or shake off the stiffness — se dérouiller les jambes (to stretch one's legs). In slang, dérouiller quelqu'un means to give someone a beating.
Examples
"Il sort marcher pour se dérouiller."
Natural Translation
He goes for a walk to limber up.
Literal Translation
He goes out walking to de-rust himself.

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