Thank for you comment.  A crash is defined as a loss of more than 20%, as seen in 1929 and 1987.  BTCUSD fell from $5.50 to $4.20 within 24 hours.  That is a 23.6% drop.  That is a crash.

Interesting though you consider a 23.6% drop as simply a market trend.  It goes to show that "volatility" is relative and some BTCUSD traders are accustom to the extreme price moves of BTCUSD.