He believes they are just attempting to kill with poison him, so he refuses to eat anything.

他相信他们正企图毒死他，因此他拒绝吃任何东西。

youdao

You will have to kill these unwanted plants with poison.

你将不得不用药物把这些讨厌的植物毒死。

《新英汉大辞典》

Three pounds of salt mixed with a gallon of soapy water, applied to the leaves and stems of poison ivy with a sprayer, will kill this tenacious pest of a plant.

把三磅盐混合在一加仑的肥皂水里，用喷雾器喷洒到叶和茎上，会杀死这种顽强的有害物。

youdao

The bed nets are treated with a poison to kill mosquitoes.

VOA: special.2010.03.10

Yeah, if they have a race riot round here, I'm gonna kill all the white folks with my poison."

当然，假如他们有那样的种族暴动，我会用毒药除掉他们，“

耶鲁公开课 - 1945年后的美国小说课程节选