劈腿 的英文怎麼說?

[1] to juggle two people[2] to two-time somebody[3] to have an affair with a married person[4] to date two men/women; two-timer[5] to date many people; to play the field[6] to cheat on somebody[7] to betray somebody

juggle 是個較詼諧的用法，非常傳神，例如:

Are you juggling both of these handsome gentleman? = 你腳踏兩條船，同時交往這兩個帥哥嗎?

to date two men/women 指同時跟兩名異性交往, two-timer 指腳踏兩條船的人. to date many people 跟 to play the field 指同時跟多名異性交往, play the field 常用在男性身上.

two-timing 指和第三者有較久的關係，一夜情通常不能算 two-timing，但只要有一次一夜情，就是 cheat on 或 betray.

A two-times B = A 對不起 B，因為 A 也跟別人交往，腳踏兩條船，這裡的 B 通常是 A 的固定伴侶

two-timer = 劈腿之人

have an affair = 用在已婚人士上，表示婚外情，用在單身漢上，表示有男朋友或女朋友，所以不一定是劈腿，只有用在已婚人士上才是劈腿