Related Clues:

• Persistent personal quirk
• ___-tac-toe
• First O?
• Breathe spasmodically
• Quirky behavior
• The first O of O-O-O
• One might be verbal
• Involuntary contraction
• First O of O-O-O
• First correct Hollywood Square
• First X?
• First X or O?
• Convulsion
• Part of three-in-a-row
• Nervous habit