Catch on to and Pick up

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

Pick up and catch on to are semantically related. in understand topic. In some cases you can use "Pick up" instead a verb "Catch on to".

Pick up verb - To acquire complete knowledge, understanding, or skill in.

Catch on to and pick up are semantically related. You can use "Catch on to" instead a verb "Pick up".