很多同学第一次看到“two-time”，都会下意识理解为“两次”，虽然two是“两个”，time也有“次数”的意思，但two-time真正的意思差得有点远。
看下牛津词典对“two-time”的解释：
to not be faithful to a person you have a relationship with, especially a sexual one, by having a secret relationship with sb else at the same time
不忠于你的伴侣，特别是在性方面，同时与另一个人有染。
所以，“two-time”也就是我们所说的“出轨；劈腿；对(情人或爱人)怀有二心”，作为动词使用。
Are you sure he's not two-timing you?
你肯定他没有背着你另有所爱？
其派生词“two-timer”就是“出轨者；脚踩两只船的人”。
英文释义：
someone who deceives a lover or spouse by carrying on a sexual relationship with somebody else
欺骗伴侣，与他人发生性关系的人
除了“two-time”，英语中还有很多表达可以用来形容对感情不忠，一起学习一下：
1. unfaithful 出轨的；不忠的
Have you ever been unfaithful to her?
你对她是否有过不忠行为？
2. have an affair 有外遇；婚外情
Though she enjoyed flirting with Matt, it had not entered her head to have an affair with him.
虽然她喜欢和马特打情骂俏，但是却未曾想过要和他相好。
*lead a double life：两面派，过着双重人格的生活，也可指婚外情
3. cheat on 背叛、偷吃、不忠；也有作弊的意思
Did you ever cheat on that Moroccan wife of yours?
你背着你的摩洛哥籍妻子有过外遇吗 ?
4. step out on <美国俚语>（在爱情上）不忠实于
They knew they were stepping out on each other.
他们俩人都知道对方对自己不忠实。
No one told him that she stepped out on him.
没人告诉他，她对他不忠贞。
5. extramarital affair 婚外情
*extramarital也有私通、婚外通奸的意思。
Her husband has admitted having an extramarital affair.
她丈夫承认了有通奸行为。
6. cuckold 绿帽子
cuckold 动词意思是“与…的妻子通奸使其丈夫戴绿帽子”；名词则是说“有不贞妻子的男人”
His wife had cuckolded him.
妻子给他戴绿帽子了。
“小三”、“渣男”、“渣女”英语怎么说？
mistress
小三，情妇的意思；也有女主人、主妇、女教师、女能人的意思。
He has a mistress in Paris.
他在巴黎有个情妇。
Tracy was his mistress for three years.
特蕾西给他做了3年情妇。
lady-friend
情妇
home-wrecker
指破坏别人家庭的人。
She is criticized for being a home-wrecker.
她因破坏别人家庭而饱受指责。
the other woman/man
影响他人婚姻的第三者
love rat
“花心的人；爱情骗子”的意思，不过这个表达并没有专指男性或女性，用在男性和女性身上都是可以的。
Keep away from love rats and enjoy your life!
远离渣男，珍爱生命！
cheater
背叛者，渣男
You've been dating that girl recently and you're a total cheater.
你最近一直跟那个女孩约会，你真是个彻头彻尾的渣男。
player/playboy
渣男，花花公子
He is such a player/playboy. How many times has he hurt you?
他是个十足的花花公子。他伤害过你多少次了？
scum
人渣，渣男
You were such a scum when you broke up with me.
你和我分手的时候真渣男！
jerk
混蛋；人渣
jerk动词意思是猛拉急拽，做名词一般用来骂人，是美剧里面经常出现的词。
I saw you in the park with another girl last night, you're such a jerk!
我看到你昨晚和另一个女孩在公园里，你真是个渣男。
分手”除了“break up”，还能怎么说？
1. split up 决裂；分手；解散
to split up with sb 与某人分手
My parents split up a few months ago.
我的父母几个月前分手了。
2. parting n. 分手；离别
George said no more until their final parting.
直到最后分手，乔治都没再说什么。
3. separate 分开；分离
separate from sb/sth 与某人/某物分开的
Lisa has separated from her long-term boyfriend.
Lisa和她交往多年的男朋友分手了。
4. finished the relationship 结束关系
He was gutted when she finished the relationship.
她跟他分手后，他伤心欲绝。
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