Synonyms for Apprehend (same or very similar meaning)
WordNet sense 1 (anticipate with dread or anxiety):
quail atWordNet sense 2 (take into custody):
arrest, collar, cop, nab, nail, pick upWordNet sense 3 (get the meaning of something):
compass, comprehend, dig, grasp, savvy, grok, get the pictureFrom the ODE community, based on WordNetadd/edit