catch on (2)

فهمیدن چیزی که در ابتدا مشکل بود

Meaning: If you catch on, you suddenly understand something that you couldn't understand at first.

For example:

  • Not all of my students understood the idea at first, but before long they all caught on.
  • Most scientists now accept that global warming is really happening, but it took a while for a lot of them to catch on.