In turn; alternately — when two or more things occur or are done in succession or by turns.
彼と私は交互に料理を作っている。
He and I take turns cooking.
子どもたちは交互にボールを投げ合った。
The children tossed the ball to each other alternately.
交互に休憩を取りながら作業を進めた。
We worked while taking breaks alternately.
右足と左足を交互に出して歩く。
Walk by putting out the right and left foot alternately.