have it off with someone

• 求爱；(同某人)乱搞不正当的男女关系；私通

have it off with someone的用法和样例：

例句

1. Could it be a sexual signal, some snicker.
   有人窃笑，它会不会是一个求爱信号。
2. It's a crime to seek the love of another's wife.
   向他人之妻求爱是一种罪恶。
3. He had already contracted a liaison with some girl.
   他和某个姑娘私通。
4. The general connived with the enemies of his country.
   这个将军私通自己国家的敌人。