swap-over
nounUK /ˈswɒpˌəʊvə/
US /ˈswɑːpˌoʊvər/
A swap-over is when two people or things trade places with each other.
The swap-over of seats let the kids sit by the window.
OTHER MEANINGS
2. A change from one system, plan, or way of doing something to another.
The swap-over to the new computer system took a whole weekend.
3. In sports, a switch of positions or sides between players or teams.
A quick swap-over on the wings confused the defenders.
4. A device or arrangement that lets two things be connected in either order.
The swap-over cable lets the two machines talk to each other.
5. An act of replacing one thing with another of the same kind.
The swap-over of old light bulbs for new ones saved energy.