Question 1

What does "cotton on" mean?

Accepted Answer

To gradually understand or become aware of something, especially after a delay.

Question 2

How do you use "cotton on" in a sentence?

Accepted Answer

It took me a few minutes, but I finally cottoned on that he was joking.

Question 3

Is "cotton on" formal or informal?

Accepted Answer

"cotton on" is informal — used mainly in casual conversation. Chiefly British and Australian English. Often implies the realisation took longer than expected. Usually appears in past tense ('cottoned on') or with 'eventually', 'finally', 'quickly', etc.

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