(v): become different in some particular way, without permanently losing one's or its former characteristics or essence
(v): exchange people temporarily to fulfill certain jobs and functions
(v): hand over one and receive another, approximately equivalent
(v): be an understudy or alternate for a role
(v): commit to memory; learn by heart
(v): reverse (a direction, attitude, or course of action)
(v): change to the contrary
(v): do something in turns
(v): perform an action, or work out or perform (an action)
(adj): prenominal) -- (every second one of a series
(adj): vs. noncyclic), cyclical -- (recurring in cycles
(adj): serving or used in place of another
(adj): vs. primary) -- (being of second rank or importance or value; not direct or immediate
(adj): prenominal), alternating(prenominal) -- (occurring by turns; first one and then the other
(adj): vs. noncyclic), cyclical -- (recurring in cycles
(adj): vs. opposite) -- (of leaves and branches etc; first on one side and then on the other in two ranks along an axis; not paired
(n): someone who takes the place of another person
(n): someone who takes the place of another (as when things get dangerous or difficult)
