He pranced into the classroom with his head held high.

pranced 是动词 prance 的过去式，prance 的意思是"昂首阔步地走"或"趾高气扬地行走"，通常用来形容人带着得意或炫耀的姿态走路，动作轻快夸张。这个词常用来描述马匹欢快地跳跃行走，用在人身上时带有比喻意味。