The Difference Between 'Buying the Dip' and 'Catching a Falling Knife'

How would you define the difference between the two?

Seems to me that catching a falling knife would involve taking whatever fiat you have and throwing it at crypto while prices are falling, leaving you with no reserves to buy as prices continue to plummet.

Buying the dip might involve a purchase now, with reserves prepared to buy later if it falls further (ie, DCA).

It seems like people are getting criticized for DCAing (generally considered a good strategy), rather than holding their money and trying to time the bottom.

Thoughts?