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catch on

B1 informal inseparable intransitive
In simple words

To finally understand something, or (for a new idea/fashion) to start becoming popular with lots of people.

Meanings

1 B1 idiomatic informal

To begin to understand something, often after a period of confusion.

"It took a few lessons, but the students eventually caught on to how the grammar rule worked."

Grammar: inseparable
2 B1 idiomatic neutral

(of a trend, idea, or fashion) To become widely popular or adopted.

"Electric scooters caught on quickly in big cities but struggled to spread to rural areas."

"The idea caught on, and soon every major city had one."

— The Economist, 2019 (on ride-sharing schemes)
Grammar: inseparable
Usage notes

Both senses are common in everyday spoken English. The 'understand' sense is often used with a negative or delay ('he was slow to catch on,' 'she didn't catch on'). The 'become popular' sense is used for trends, technologies, or ideas.

Commonly used with

trend fashion idea joke quickly slowly

Forms

Base
catch on
I/you/we/they
3rd person
catches on
he/she/it
Past simple
caught on
yesterday
Past participle
caught on
have + pp
-ing form
catching on
continuous

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Synonyms

understand grasp twig realise become popular take hold

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