catch on
wordnet sense
Web Definitions:
- understand, usually after some initial difficulty; "She didn't know what her classmates were plotting but finally caught on"
- become popular; "This fashion caught on in Paris"
- 1 vi (to understand) rikai suru: Sono uchi rikai suru. (You’ll catch on in time.)
- At first, Sarah didn’t understand what Harry was doing, but she soon caught on.