in for a penny and in for a pound

• adv. 一不做二不休

in for a penny and in for a pound的用法和样例：

例句

用作副词 (adv.)

1. As I am in for it, I must proceed.
   既然势成骑虎，我就一不做二不休。
2. As well be hung for a sheep as a lamb.
   一不做二不休，要干索性大干。