1. (v.) To displace and take the place of; to supersede; as, a rival supplants another in the favor of a mistress\ or a prince.

2. (n.) To overthrow, undermine, or force away, in order to get a substitute in place of.

act for bounce cast out change places with crowd out cut out dismiss displace double for eject exchange expel fill in for force out ghost ghostwrite oust pinch-hit relieve remove replace represent spell spell off stand in for step subrogate substitute substitute for succeed supersede swap places with turn out understudy for unseat usurp