apprehend

appreciate, assimilate, behold, catch, catch on (to), cognize, compass, comprehend, conceive, cotton (to or on to), decipher, decode, dig, discern, get, grasp, grok, intuit, know, make, make out, perceive, recognize, register, savvy, see, seize, sense, tumble (to), twig, understand

arrest, bust [slang], collar, nab, nail, nick [British slang], pick up, pinch, pull in, restrain, run in, seize