Verb (5-dan, る, intransitive)
1.  to succeed;  to relieve;  to replace
esp. 替わる, 替る
2.  to take the place of;  to substitute for;  to take over for;  to represent;  to hand over (telephone)
esp. 代わる, 代る
3.  to be exchanged;  to change (places with);  to switch
esp. 換わる, 換る