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catch on (2)

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

Synonym: cotton on (informal), twig (informal)

For example:

  • catch on Not all of my students understood the idea at first, but before long they all caught on.

  • catch on Most scientists now accept that global warming is really happening, but it took a while for a lot of them to catch on.

Quick Quiz:

It took a while for Sandra to catch on, but at last she
  1. got the bus
  2. got the idea
  3. got the money

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