Step climb

For example: a step climb is comprised of many climb and cruise segments.

Burning fuel decreases the weight of an aircraft which may then choose to increase its flight level to further improve fuel consumption. For example an aircraft may be able to reach FL290 early in a flight, but step climb to FL370 later in the route ...

Best remedy is to lift-off and remain in ground effect, accelerate to VX or VY then continue climb out. I call this a step climb, it is also used when climbing out over obstacles from short runways.