He disguised himself with a wig and mustache, so no one recognized him.

disguised 是动词 disguise 的过去式，dis- 是表示"否定、去除"的前缀，guise 意思是"外观、伪装"，所以 disguise 字面意思是"改变外观"，即"伪装、假扮"的意思。