The coastal population began to sicken.

沿海的索马里人开始生病。

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The dog began to sicken and soon died.

这只狗开始生病并且很快就死了。

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The animal began to sicken and soon died.

那动物开始生病，不久就死了。

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But when he finally gets ill and comes up to the fact of his mortality, that his body is going to sicken and eventually die, the fact of his mortality seems to shock him, seems to surprise him.

但他最终病倒，和死亡面对面，身体每况愈下，最终死亡，这个事实让他震惊不已，他非常惊讶。

耶鲁公开课 - 死亡课程节选

The quickest way to sicken a modernist is to bring him to a midcentury Los Angeles diner.

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This makes sense: in those areas with a high level of radiation, living things would tend to die or sicken and fail to reproduce.

ECONOMIST: Radiation and evolution

But the virus doesn't appear to notably sicken infected birds, unlike H5N1, another avian-flu virus that is deadly in birds and occasionally infects people.

WSJ: Bird Flu Found Outside China's Mainland