denigrate [ˈdenɪgreɪt]

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vt.诬蔑，诽谤

to say that someone or something is not good or important

It was unkind to denigrate her achievement. 贬低她的成就是刻薄的。
To assert this is to denigrate the effectiveness of the police. 坚持这一点就是贬低警方的办事能力。