1. past tense and past participle of quadruple; multiplied by four or made four times as large

1. having been multiplied by four; four times the original amount

Examples

• The company’s profits quadrupled over the past decade.
• Housing prices have quadrupled since 1990.
• She quadrupled her investment in just two years.
• The population of the city quadrupled after the discovery of oil.
• With quadrupled security measures, the event proceeded safely.
• The quadrupled budget allowed for much better equipment.
• Sales quadrupled during the holiday season.