Possible Clues:

• When tripled, and so on
• When tripled, 'and so on'
• One-third of et cetera?
• When tripled, "and so on"
• Thrice, 'etc.'
• When said three times, et cetera
• When repeated, "et cetera"
• Tripled, it means 'and so on'
• "To make a long story short" word
• Et cetera, when said three times