Synonyms for "usurp": seize, supplant, appropriate, commandeer, arrogate, infringe, preempt, assume, steal, displace, replace, succeed, oust, overthrow, wrest, confiscate, annex, despoil, expropriate, plunder, pilfer, press, encroach, trespass, violate, command, supersede, substitute, interlope, subvert, dispossess, inherit, convert, reign, rule, grasp, cling.