Plummet

To fall straight down very quickly, like when a roller coaster drops suddenly or when a rock is thrown off a cliff.

Examples

• When the temperature suddenly dropped overnight, we woke up to find that the thermometer had plummeted below freezing, leaving a thick layer of frost on the grass.
• During the science experiment, we watched in awe as the toy rocket launched high into the air before it began to plummet back down to the ground with a loud thud.
• As the stock market reacted to the latest news, the prices of many companies began to plummet, causing concern among investors and financial experts alike.

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Antonyms