cotton on
US /ˈkɑːt.ən ɑːn/
UK /ˈkɑːt.ən ɑːn/

1.
anlamak, farkına varmak
to understand something after a period of not understanding it
:
•
It took him a while to cotton on to what I was saying.
Ne dediğimi anlaması biraz zaman aldı.
•
She finally cottoned on to the joke.
Sonunda şakayı anladı.