Speaking of knowing things by heart, when did that expression disappear from common usage?
We know it by heart. A lovely metaphor.
These days any and all discussion of remembered knowledge involves obligatory reference(s) to "spitting," "vomiting," and/or "regurgitating."
I swear, if I have to read one more person saying that "spitting back knowledge" isn't "thinking critically," I will do some copious regurgitating of my own.