knock under的用法和樣例：
例句
用作及物動詞 (vt.)
- His army never came under the yoke of invaders.
他的軍隊從來不向侵略者屈服。 - Tom did not knuckle down under the attacks.
面對這些攻擊，湯姆並沒有屈服。
辭彙搭配
- knock the sand from under someone 推翻某人的打算...
