nose-dive

When used improperly those encouraging statistics take a nose dive.

The Inn still remains charming, but the food and service have taken a nose dive.

Well, Bridgeman isn't back and Tam said he saw him nose-dive behind the German trenches.

We were almost sure that was no atmosphere there—which meant we'd nose dive into the rocks at five thousand miles an hour.

He was in the clouds by the time I located him, and rapidly going out of control into a spinning nose-dive.

In fact, lots of pilots thought that when once you got into a spinning nose dive there was no way of coming out of it.

The last time he had seen me I was going down to earth with a bullet in my face and my machine doing a spinning nose dive.