catch on (2)
Meaning: If you catch on, you suddenly understand something that you couldn't understand at first.Synonym: cotton on (informal), twig (informal)
- catch on Not all of my students understood the idea at first, but before long they all caught on.
- catch on Most scientists now accept that global warming is really happening, but it took a while for a lot of them to catch on.
It took a while for Sandra to catch on, but at last she