Catch on to and Catch on

Catch on to verb - To come to an awareness of.

Catch on and catch on to are semantically related. In some cases you can use "Catch on" instead a verb "Catch on to".

Catch on verb - Understand, usually after some initial difficulty.

Catch on to and catch on are semantically related. Sometimes you can use "Catch on to" instead a verb "Catch on".