catch on

[catch on] {v.}, {informal}

1. To understand; learn about. — Often used with "to".

/You'll catch on to the job after you've been here awhile./

/Don't play any tricks on Joe. When he catches on, he will beat you./

2. To become popular; be done or used by many people.

/The song caught on and was sung and played everywhere./

3. To be hired; get a job.

/The ball player caught on with a big league team last year./

Source: A Dictionary of American Idioms

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