Verb (5-dan, る, intransitive)
1.  to be buried;  to be covered;  to be surrounded
2.  to overflow;  to be crowded;  to be filled
3.  to be repaid (e.g. debt);  to be replenished
when read as "うまる"
4.  to be filled (e.g. blank, vacancy, schedule)
when read as "うまる"