Usage Note
Reha (short for Rehabilitation) is a course of restorative treatment after illness or surgery. Eine Reha machen or beantragen (to do/apply for rehabilitation) are standard phrases. The full form Rehabilitation is also used.
Examples
"Nach dem Herzinfarkt verbrachte er drei Wochen in der Reha."
Natural Translation
After the heart attack he spent three weeks in rehabilitation.
Literal Translation
After the heart attack he spent three weeks in the rehab.

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