Here are current indexes with their 50, 100 & 200 day moving averages. The 200 day moving average is the blue line at the bottom & historically provides a lot of support in bull markets. You can see the only major US index still above the 200 dma is the Dow (down about 350 on the day as I write this).
If all four of these indexes have spent the last two years well above the 200dma, what does it mean if they all break sharply below it?
Perhaps a trend change, or another reason for central banks to buy more bubble juice.
Bull or bear all animals eventually shit.