parade one's superiority and strive to outshine others; flaunt one's superiority and seek to do others down; 逞强好胜
She is fond of flaunting her superiority before her friends and schoolmates. 她好在朋友和同学面前逞强。
牛津高阶第八版
美国韦氏词典
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维基百科 (自由的百科全书)