1. past tense and past participle of septuple; multiplied by seven or increased sevenfold

Examples

• The company’s profits septupled over the past decade.
• After the discovery, the value of the rare coin septupled overnight.
• The population of the small town septupled during the gold rush.
• Her investment septupled when the startup went public.
• The number of participants septupled from the previous year’s event.