Definition & Meaning of "stir-crazy"in English

What does "stir-crazy" mean in slang?

The structure combines "stir" (old British slang for prison, dating back to the 19th century) with "crazy," forming a compound adjective that describes the psychological effects of incarceration. It is used to describe someone who is mentally restless, anxious, or unbalanced due to prolonged confinement, whether in prison, a small room, or during extended periods indoors. People typically say they are "going stir-crazy" after being stuck at home during bad weather, illness, or quarantine, not only in prison contexts.