a venomous snake with large hinged fangs, typically having a broad head and stout body, with dark patterns on a lighter background
蝰蛇。
a spiteful or treacherous person
险恶的人;背信弃义的人。
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viper in one's bosom a person who betrays those who have helped them 怀中的毒蛇,忘恩负义的人
"early 16th cent.: from French