cotton on

Từ điển WordNet v3.1 - WordNet Dictionary

verb

understand, usually after some initial difficulty
- She didn't know what her classmates were plotting but finally caught on
• Syn:
catch on, get wise, get onto, tumble, latch on,
twig, get it
• Hypernyms:
grok, get the picture, comprehend, savvy, dig,
grasp, compass, apprehend
• Verb Frames:
- Somebody ----s
- Somebody ----s PP
- Somebody ----s something (for: get onto)