free-fall

基本解释

General Motors’ shares went into free-fall on Thursday, dropping 31% after a rating agency threatened to downgrade its debt.
通用汽车的股票在周四自由落体，在某评价机构威胁要调低其评价后，股价下降了31％。
I think it means the rate of decline in the economy, which during late last year and the first quarter of this year was like a free-fall, is definitely slowing down.
我认为，这表示，经过去年年底和今年第一季度自由落体式的经济下滑后，现在经济衰退的速度绝对是放慢了。
However, through free-fall testing, the researchers could quantitatively measure the samara’s flight dynamics and use this information to control the samara’s autorotation and flight path.
然而，通过自由落体测试，研究者可以量化的测量翅果的飞行动力并且用得到的信息数据来控制翅果的自旋和飞行轨迹。

with bold action and outside-the-box thinking that has helped put the brakes on our economic free fall,"
Strauss-Kahn told an audience for 2010 at Washington's National Press Club that there are signs that the free-fall in the global economy may be starting to abate.

In the final years of the Third Reich, his standard of living was in free-fall.
FORBES: Market Economy Distortions Can Get Very Dangerous
In the months running up to the election in November 2008, the economy entered virtual free-fall.
ECONOMIST: What did Barack Obama’s stimulus package really achieve?

If the value or price of something goes into free fall, it starts to fall uncontrollably.
In parachuting, free fall is the part of the jump before the parachute opens.