cotton on

Verb

Meaning

understand, usually after some initial difficulty

Source: WordNet

twig tumble catch on get onto latch on get wise get know follow understand catch interpret realize crack grasp

Show all synonyms

miss mistake confuse misunderstand misinterpret misconceive

Show all antonyms

compass grasp dig comprehend apprehend grok

She didn't know what her classmates were plotting but finally caught on Source: Internet