趁虚而入

[chèn xū ér rù]

'Take Advantage of A Weakness', it usually refers to people or events that exploit vulnerabilities, which can mean catching opportunities or imply negative behaviors relying on loopholes.

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趁你病时买下你命 [chèn nĭ bìng shí măi xià nĭ mìng]
In a dark humor style it means taking advantage during someones vulnerable moment implying manipulation ...