catch on

Verb	1.	catch on - understand, usually after some initial difficulty; "She didn't know what her classmates were plotting but finally caught on" cotton on, get it, get onto, get wise, latch on, twig, tumble apprehend, comprehend, get the picture, savvy, grasp, compass, dig - get the meaning of something; "Do you comprehend the meaning of this letter?"
	2.	catch on - become popular; "This fashion caught on in paris" change - undergo a change; become different in essence; losing one's or its original nature; "She changed completely as she grew older"; "The weather changed last night"

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