godan verb (-su)
destroy by cutting; kill off (trees)
Used specifically for killing trees or plants by cutting them down or cutting into them. The verb implies deliberate destruction through cutting.
庭の枯れかけた木を切り枯らした。
I cut down and killed the dying tree in the garden.
雑草を根元から切り枯らす。
Kill the weeds by cutting them at the base.