1
to be renewed;to change
長年の習慣はなかなか改まらない。
Old habits die hard.
2
to be improved;to be reformed;to be revised;to be corrected
3
to stand on ceremony;to be formal
4
to take a turn for the worse (of an illness);to take a serious turn
esp. 革まる
Other forms
革まる 【あらたまる】