He kept trying to diminish his colleague's contributions during the meeting to make himself look better.

### 解释 diminish 是动词，由前缀 di-（表示"向下"）和词根 minish（来自拉丁语 minuere，意为"减少"）组成，意思是"减少、削弱、贬低"。在句中指通过言语或行为降低他人价值或重要性。