expression

catch on

to become popular; to understand

In Phrasal Verbs

In more detail

1. (verb) to become popular or fashionable

2. (verb) to understand something

Examples

1. The new TV show caught on quickly with audiences.
2. After the teacher explained it three times, I finally caught on.

How to use catch on

Catch on has two distinct but related meanings. The first refers to something becoming widely adopted or fashionable, often after a slow start (The trend finally caught on with teenagers). The second means to understand or grasp something, sometimes implying a delayed realization (She caught on to the joke after a few seconds). Both uses are informal and conversational, common in everyday speech but less frequent in formal writing.

Common phrases

catch on quickly
catch on with audiences
catch on with the public
eventually catch on
never quite catch on

Synonyms

take off · become popular · grasp · understand · comprehend

Word family

catching on · caught on

A common mistake

Learners sometimes confuse catch on with catch up, which means to reach someone or to complete delayed work. Also, some fail to recognize that catch on is phrasal and cannot be split with an object in the popular-trend sense.

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