1.Break a leg! 祝你好运！

2.fall head over heels in love 爱得神魂颠倒

3.get cold feet 沮丧；临阵退缩

4.get off on the wrong foot 出师不利，起步便错

5.cost an arm and a leg 价格非常昂贵

6. have an affair with someone 与某人有一腿

7.two timer 劈腿