Verb (5-dan, る, intransitive)
1. to be renewed; to change
年度が改まって、新しい部署に移った。With the new fiscal year, I moved to a new department.
2. to be improved; to be reformed; to be revised; to be corrected
3. to stand on ceremony; to be formal
あら、改まってどうしたの？Oh, what's with the formality?
4. to take a turn for the worse (of an illness); to take a serious turn
esp. 革まる