latch on
     v 1: adopt; "take up new ideas" [syn: {take up}, {fasten on}, {hook
          on}, {seize on}]
     2: 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},
         {cotton on}, {twig}, {get it}]
Source: WordNet® 2.0