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（尤指男性）驕傲自大的人，愛炫耀的人，衣著花里胡哨的人
If you describe someone, especially a man, as a peacock, you mean that they are arrogant or like dressing or behaving in a way that draws attention to themselves.
例句
He was a born peacock...
他天生愛慕虛榮。
He introduced himself as 'the leader' and strutted up and down like a peacock.
他自稱“領導”，像個孔雀似的趾高氣揚地走來走去。