to call again; to call someone back
会議後、彼に掛け直した。
After the meeting, she called him back.
一度切って、会社の電話で掛け直して。
Please hang up and call me back on the office line.
交渉中に切れたら、すぐに掛け直す。
If the call drops during the negotiation, I will call back immediately.