bite是咬，bullet是子弹，bite the bullet可不是咬住子弹，真实含义是“硬着头皮做，咬紧牙关应付”。

【例句】
The president asked the board to bite the bulletto the crisis.
董事长让董事会咬紧牙关顶住这场危机。

I'm going to bite the bullet and buy that new car.
我犹豫再三，终于决定硬着头皮去买那辆新车。