Godan verb with 'ru' ending, Intransitive verb
to fall into (e.g. a hole)
これが原因でたいていの街の浴場は困難な状態に陥った。This caused most of the local bath-houses to fall on hard times. to fall into (chaos, depression, dilemma, illness, etc.)
to fall into (a trap, etc.)
to fall; to surrender; to capitulate
Also written 落ち入る【おちいる】