城门失火，殃及池鱼
chéng mén shī huǒ , yāng jí chí yú
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1 a fire in the city gates is also a calamity for the fish in the moat (idiom); the bystander will also suffer
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2 fig. you can't escape responsibility for your actions
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3 ask not for whom the bell tolls - it tolls for thee