nose-dive

基本解释

That is why there is frankly developers: Once the marketing tools too often, the sales may be a nose-dive .
这就是为什么坦率开发商：一旦市场营销工具，往往在销售可能是一个垂直降落。
It will look like you have a choice, speed or height, but either way you're still going to nose-dive into the ground.
看起来还有选择，选择速度或是高度，但无论如何最后还是会大头朝下坠向地面。
If tight turnaround time or bad news given out with no solution sends your boss's demeanor into a nose-dive, take note, be patient and more strategic.
如果周转时间很紧张或得到了坏消息却没有解决方案让你老板的风范跌入谷底，做做笔记，让自己有点儿耐心并更具有战略性。
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The number of workers per Medicare beneficiary already has plummeted from 4.1 in 1970 to 3.2 in 2011 and is expected to nose-dive even further to 2.1 by 2080.
FORBES: U.S. Treasury to President Obama: Medicare's Current Policy 'Is Unsustainable'
When that happens markets will nose-dive.
FORBES: When Bad News Is Good News For Stocks
On another dismal day for U.S. equities, a combination of bad economic data and riots in debt-ridden Greece have sent markets on a nose dive, as they approach a seventh consecutive week of declines.
FORBES: Stocks Sell Off Amid Greek Riots

If prices, profits, or exchange rates nosedive, they suddenly fall by a large amount.
Nosedive is also a noun.
If something such as someone's reputation or career nosedives, it suddenly gets much worse.
Nosedive is also a noun.