cutover
nounUK /ˈkʌtˌəʊvə/
US /ˈkʌtˌoʊvər/
A cutover is when people switch from using one thing to using a new thing.
The cutover to the new computer system happened over the weekend.
OTHER MEANINGS
2. An area of land where all the trees have been cut down.
The forest was cleared, leaving a wide cutover behind.
3. The act of cutting trees on a piece of land.
Loggers finished the cutover before winter arrived.
4. A change from one method or system to another in a planned way.
The factory planned a careful cutover to the new machines.