He made a fool of himself by tripping on stage during the performance.

made 是动词 make 的过去式，意思是"做、制造"。 a 是不定冠词，表示"一个"。 fool 是名词，意思是"傻瓜、愚蠢的人"。 of 是介词，表示所属关系或构成关系。 himself 是反身代词，意思是"他自己"。 made a fool of himself 是一个固定短语，字面意思是"把自己变成一个傻瓜"，实际意思是"出丑、闹笑话"，指因为愚蠢的行为而使自己难堪。