plunge down (something)

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plunge down (something)

To fall or plummet down something at a high and often uncontrollable speed. The bus skidded on the ice and plunged down the side of the ravine. The rollercoaster plunged down the near-vertical drop, making everyone on board scream with delighted terror.
See also: down, plunge

plunge down something

to run or fall down something. The car plunged down the hill and ran into a tree at the bottom. The bicyclist plunged down the side of the hill at a great speed.
See also: down, plunge