英文：two-time (v.)
說明：two-time someone = cheat on someone，意為「對伴侶不忠」。two-time 的過去式和過去分詞都是 two-timed，第三人稱單數動詞為 two-times，而現在分詞為 two-timing。劈腿的人叫做 two-timer。
例句：
- Are you sure Allen’s not two-timing you? (妳確定艾倫沒劈腿嗎？)
- Amy used to two-time his husband. (艾美過去常背著她先生與人偷情)
- Her boyfriend cheated on her. (她男友劈腿了)