two-timing

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释义
脚踏两只船；劈腿
The practice of being sexually unfaithful.

例句
Johnny: Can you tell Max I'm here?
Earl: That depends. Are you still a two-timing bum?(2 Broke Girls)
强尼：能告诉麦克斯我来了吗？
厄尔：看情况吧。你还是脚踏两只船的无业游民呢？（破产姐妹）