English

Definition of catch on phrasal verb from the Oxford Advanced Learner's Dictionary

 

catch on

 phrasal verb
phrasal verb
 
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Phrasal Verbs
to become popular or fashionable He invented a new game, but it never really caught on.

catch on (to something)

 
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(informal) to understand something He is very quick to catch on to things.
See the Oxford Advanced American Dictionary entry: catch on