Verbs

(v)grok, get the picture, comprehend, savvy, dig, grasp, compass, apprehendget the meaning of something“Do you comprehend the meaning of this letter?”
(v)collar, nail, apprehend, arrest, pick up, nab, coptake into custody“the police nabbed the suspected criminals”
(v)apprehend, quail atanticipate with dread or anxiety