If a crash is coming, why not sell and re-buy?

It seems like everybody agrees that a crash is coming, but the advice I read is to not sell and to hold for the long run, Bob-style. Why not sell now and buy it back in a bit and still hold for the long run if everything is pointing towards a huge dip? Yes, I know very little about how this works.

Submitted December 23, 2018 at 11:35AM by seabasse http://bit.ly/2EM07w8