The teacher answered the students each in turn.
Each member of the group, in turn, rose to share a personal story, until nearly everyone in the room had spoken.
Eventually, each of the countries in turn would be brought to submission by the invading force.
The vassals were subject to their lords, who in turn were subject to barons or kings.
My car was hit by a truck, which in turn was hit by the van.
Mr. X leaked the secret to Mr. Y who in turn leaked it to Mr. Z.