set one's jaw 坚持到底

【讲解】

jaw的本义是“颌”；动词set有“使脸部出现坚定不移的表情”的意思。set one's jaw用来形容人把下巴一沉，表现出坚毅不服输的表情。

【对话】

A:I haven't seen you for a long time. What are you doing?

A:好久不见了，你在干什么？

B:I've been keeping on studying the piano.

B:我一直在学弹钢琴。

A:How's it going?

A:学得怎么样？

B:Too bad. I failed the test for degree. So I have to set my jaw to do more practice.

B:糟透了，我等级考试没过，所以我只好咬紧牙关进行更多的练习。