I don't understand

Also found in: Dictionary, Acronyms.

I don't understand (it).

 and I can't understand (it).
I am confused and bewildered (by what has happened). Bill: Everyone is leaving the party. Mary: I don't understand. It's still so early. Bob: The very idea, Sue and Tom doing something like that! Alice: It's very strange. I can't understand it.
See also: understand