Related Clues:

• ___ Tacs (breath mints)
• Knee jerk, for one
• Facial twitch
• Muscle movement
• First ''O'' of O-O-O
• '-- Tac Dough'
• First correct ''Hollywood Squares'' square
• Start of a winning combination
• It can't be helped
• Nervous twitch
• Small spasm
• Nervous reaction
• One X of XXX
• Half a breath mint?
• -- -tac-toe