informal
1
: a program for helping people who have problems with drugs, alcohol, etc.
—often used after in or into
He is in rehab.
She checked herself into rehab.
2
: the process of helping someone (such as an injured patient or a drug user) to become healthy again : the process of rehabilitating someone
He has had two months of rehab. = He has been/gone through two months of rehab.
The rehab for his leg injury is going well.
a rehab center/program
rehabs; rehabbed; rehabbing
US, informal
: rehabilitate
It could take him several months to rehab his knee.
trying to rehab drug addicts
They're planning to rehab that old building.
He's still rehabbing from the injury.
Cite this Entry
“Rehab.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/rehab. Accessed 21 Jun. 2026.
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