catch on

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catch on ‎(third-person singular simple present catches on, present participle catching on, simple past and past participle caught on)

  1. (intransitive, idiomatic) To begin to understand; to realize.
    He didn't have to explain; I caught on right away.
  2. (intransitive, idiomatic) To become popular; to become commonplace; to become the standard.
    It's a crummy idea, and I certainly hope it does not catch on.