1. falls or drops straight down very quickly
2. decreases rapidly in value, amount, or degree

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

Examples

• The stock price plummets after the scandal breaks.
• A rock plummets from the cliff into the ocean below.
• Sales plummeted during the economic recession.
• The temperature plummets overnight in winter.
• The carpenter uses a plummet to ensure the wall is straight.
• Her confidence plummets after receiving harsh criticism.
• The plane plummets toward the ground before the pilot regains control.