in the middle of(真ん中で): She was in the middle of cleaning when the phone rang. (電話が鳴ったとき、彼女は掃除の真っ最中でした) - 試験に出る! 英単語検索辞書

in the middle of(真ん中で): She was in the middle of cleaning when the phone rang. (電話が鳴ったとき、彼女は掃除の真っ最中でした)

She was in the middle of cleaning when the phone rang.