pick up on

verb3

1. •
   To notice, observe, learn, or understand, especially something otherwise overlooked.

   • "Remember, I know more about it than only what you picked up on that morning." — 1882
2. •
   To continue or build upon (for example, a task, analysis, or narrative), beginning from a point at which someone has previously stopped.
3. •
   To adopt a practice in which others already engage.

   • "What you've got to do is, you've got to study the guy and try to pick up on his techniques, try to pick up what he's real good at." — 2004