noun someone who takes the place of another person
verb go back and forth; swing back and forth between two states or conditions
Synonymsjump
verb be an understudy or alternate for a role
Synonymsunderstudy
verb reverse (a direction, attitude, or course of action)
verb do something in turns
Synonymstake turns
adjective every second one of a series
Similarcyclic
adjective of leaves and branches etc; first on one side and then on the other in two ranks along an axis; not paired
Oppositesopposite
Source: WordNet 3.1, Princeton University
