plunge down (something)

plunge down (something)

To run, fall, or plummet down something at great, 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