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Verb: catch on
  1. Understand, usually after some initial difficulty
    "She didn't know what her classmates were plotting but finally caught on";
    - get wise, get onto, tumble, latch on, cotton on, twig, get it
     
  2. Become popular
    "This fashion caught on in Paris"

Derived forms: catches on, caught on, catching on

Type of: apprehend, change, compass, comprehend, dig, get the picture, grasp, grok [N. Amer], savvy