"Cylinder shutdown" refers to the action of deactivating one or more cylinders in a vehicle's engine during low power requirements, reducing fuel consumption and improving efficiency. Full definition
The 2019 5.3 - liter will have Dynamic Fuel Management (variable cylinder shutdown), variable valve timing, and gasoline direct injection. (extremetech.com)
There will be a total of four engines, V6 and V8, all gasoline, none with cylinder shutdown; there will be auto stop - start. (extremetech.com)
Honda and some others use automatic cylinder shutdown and noise cancellation (to mask the unevenness of half the engine not firing). (extremetech.com)