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English definition of “catch on”

catch on

phrasal verb with catch
 
 
/kætʃ/ verb [T] (caught, caught)
to become popular: He invented a type of virtual reality helmet, but it never caught on. Online trading has been slow to catch on in this part of the country.
to understand something: Younger people catch on right away. It is older people that need to be convinced.catch on to sth They are slowly catching on to the fact that this decision has made them very unpopular.
(Definition of catch on from the Cambridge Business English Dictionary © Cambridge University Press)
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