knuckle under

v. 认输, 屈服

例句与用法：

If you want to pass that exam, you'll have to knuckle down (to some hard work).

你要想考试及格，就得开始下功夫(苦干)了。

词形变化：

异体字: knuckleball | 名词: knuckleballer |

详细释义：

屈服; 认输

They refused to knuckle under to any pressure.

他们拒不屈从任何压力。