1. to fall or drop straight down very quickly
2. to decrease rapidly in value, amount, or quality

1. a weight attached to a line, used for measuring depth or testing verticality

Examples

• The rock plummeted into the canyon below.
• Stock prices plummeted after the announcement.
• The bird plummeted toward the water to catch a fish.
• Sales have plummeted since the new competitor arrived.
• The carpenter used a plummet to ensure the wall was straight.
• Temperatures plummeted overnight, causing ice to form.
• The company’s reputation plummeted following the scandal.