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Where were you when the S&P500 went down 35% in a just a month after the Covid thing, for instance?...
That's just it. A 35% "crash" in a month in my mind is not a downtrend.
If you were to reverse the chart, flip it upside down over the past 6 months, that 6-month trend down would be a, well, downtrend.
Oct 2018 to Dec 24th 2018 was a downtrend to my eyes. A sustained drop over a longish period a time. Just semantics I suppose.