Meanings of takes a plunge in English

The river here takes a plunge of ten feet in seventy yards, and drops five feet at a single bound.

He takes a plunge.

Here the river takes a plunge of sixteen hundred feet, the water falling like snowy rockets bursting into spray from that great height.

"Anytime the stock market takes a plunge, it's the government causing the decline, stealing people's hard-earned money and making them start all over again."