- 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
=> Somebody ----s something