To be puffed up with pride; to be swaggering and arrogant; to walk with an air of self-importance.
小明在比赛中取得了一点成绩，就开始足高气扬，对待身边的朋友也变得有些傲慢。
After achieving a small success in the competition, Xiao Ming became puffed up with pride and started treating his friends around him with some arrogance.
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