expression, godan verb (-mu)
Idiomatic expression for being anxious or uneasy, often about something uncertain or out of one's control.
試験の結果が気になって、気をもんでいる。
I'm worrying about the exam results.
彼は何も言わないので、こちらが気をもむばかりだ。
He says nothing, so I just keep fretting.