Collapse, from the Latin cuм "with" and lapsus "fall". When used as a prefix, cuм becomes com-, con-, col-, etc.
The main index, the DOW, is down 420 points as of this writing.
As I pointed out 6 or 7 years ago, during the Great Depression every day wasn't a down day on the Stock Market. There were quite a few rallies, even large ones lasting many weeks. But the general trend was, inexorably, downward.
There's no reason why history wouldn't repeat itself here.
Also, a large "record" up day is actually a symptom of severe, grave illness in the markets. It's part of how an unwinding or collapse happens: i.e., wild swings from day to day and week to week.
If things were REALLY ok, and REALLY normal, we'd be having boring days on the stock market -- every day. Not record drops OR rises.
And now you know "the rest of the story". The more you know. And now you know. Knowing is half the battle.