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WordNet-OnlineFree dictionary and thesaurus of English. Definitions, synonyms, antonyms and more...
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Verb catch on has 2 senses
catch on, get wise, get onto, tumble, latch on, cotton on, twig, get it - understand, usually after some initial difficulty; "She didn't know what her classmates were plotting but finally caught on"--1 is one way to get the picture, comprehend, savvy, dig, grasp, compass, apprehend
 Sample sentences:
 Somebody ----s
 Somebody ----s PP
 
catch on - become popular; "This fashion caught on in paris"--2 is one way to change
 Sample sentences:
 Something ----s
 Something is ----ing PP
 
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