godan verb (-mu), intransitive verb
Used for tensing abdominal muscles, as during childbirth, heavy lifting, or forceful exhalation. Often implies a grunting effort.
お産のとき、助産師さんに「いきんでください」と言われた。
During labor, the midwife told me, 'Please bear down.'
重い荷物を持ち上げようとして、いきんだ。
I strained as I tried to lift the heavy luggage.