1. Restless, uncomfortable, or impatient due to inactivity 
2. (informal) of a prisoner, mentally unbalanced due to prolonged incarceration

Encyclopedia: Stir-crazy

• by-and-by
• by-bid
• by-blow
• by-election
• by-line
• Byblos
• bycatch
• Bydgoszcz
• bye
• bye-bye
• bye-election
• Byelarus
• byelaw
• Byelorussia
• Byelorussian
• bygone
• bylaw
• byname
• BYOB
• bypass
• bypass capacitor
• bypass condenser
• bypast
• bypath
• byplay