A two-timer is the person who does the two-timing: someone who keeps a secret second relationship going while already with a partner.

A two-timer is the person who does the two-timing'two-timer'指的是做出two-timing(劈腿)這件事的人 someone who keeps a secret second relationship going while already with a partner也就是已經有伴侶了、卻偷偷維持著第二段關係的人

It is a noun and an insult, but a light, almost comic one — the sort of thing said with a slap on the arm or across a bar, not the word you would use about a real betrayal that has broken someone's heart. For that, English says 'he cheated on her' and leaves the name-calling alone.

It is a noun and an insult這是一個名詞，也是一種罵人的話 but a light, almost comic one但語氣輕、幾乎帶點戲謔 the sort of thing said with a slap on the arm or across a bar是那種拍拍手臂、或在酒吧裡隨口說出來的話 not the word you would use about a real betrayal that has broken someone's heart不是用來講那種真的傷透一個人心的背叛。For that那種情況 English says 'he cheated on her'英文會說'he cheated on her'(他背叛了她) and leaves the name-calling alone而不會特地用罵人的字眼

It sounds dated, the way old films sound dated; a young person today would more likely say 'he's a cheater' or just 'he cheated'. Because of that datedness it turns up a lot in song titles and headlines, where the slightly old-fashioned ring is the point.

It sounds dated這個字聽起來有點過時 the way old films sound dated就像老電影給人的那種過時感 a young person today would more likely say 'he's a cheater' or just 'he cheated'現在的年輕人比較會說'he's a cheater'(他是個劈腿仔)或直接說'he cheated'(他劈腿了)。Because of that datedness就是因為這種過時感 it turns up a lot in song titles and headlines它常常出現在歌名和新聞標題裡 where the slightly old-fashioned ring is the point那種帶點古早味的語感正是重點所在

Note it describes a pattern of behaviour, not one mistake — calling someone a two-timer says this is who they are. As with the verb, keep it away from the other 'two-time': 'a two-time champion' is a person who won twice, and 'two-timer' never means that.

Note it describes a pattern of behaviour, not one mistake要注意，這個字講的是一種行為模式、不是一次的錯誤 calling someone a two-timer says this is who they are叫一個人two-timer，等於在說這就是他這個人的樣子。As with the verb跟動詞的情況一樣 keep it away from the other 'two-time'要跟另一個'two-time'的用法分清楚 'a two-time champion' is a person who won twice'a two-time champion'(兩屆冠軍)指的是贏過兩次的人 and 'two-timer' never means that而'two-timer'從來不是這個意思