Related Clues:

• You might do it up and down
• Terminal digit
• Tot's ''little piggie''
• Pirouetter's pivot
• One O of OOO
• Shoe's tip
• Word with tapper
• 'Little piggy'
• Baby's ''piggy''
• Big __
• One of the little piggies
• Bathwater tester?
• Ballerina's digit
• Sock end
• Piggy, e.g.