The DICT Development Group

  latch on
      v 1: take hold of or attach to; "The biochip latches onto the
           genes"
      2: adopt; "take up new ideas" [syn: take up, latch on,
         fasten on, hook on, seize on]
      3: 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, latch on, cotton on, twig, get it]