Knuckle under without a fight?

不抵抗就屈服？

He refused to knuckle under to the enemy.

他拒绝向敌人投降。

I won't knuckle under.

我不会屈服。

Even if times get tough, they don't knuckle under.

即使面临困难的时候，他们也不屈服。

The United States, he said, did not knuckle under to demands.

他说，美国不会屈从于他人的要求。