knock against

1.I knocked my head against the doorpost and hurt it.

我的头撞在门柱上, 撞伤了。

2.I cracked the platter when I knocked it against the table.

我把盘子撞到桌子，它被碰裂了。

3.In fact, the biggest knock against Iverson -- that he's a chucker -- couldn't be further from the truth at this note of his career.

事实上，从佛森职业生涯的记录来看，单打独斗这种打法是他最大的阻碍。