expression · to hold one's head high and chest out, signifying pride, confidence, or self-assurance

获胜的运动员昂首挺胸地走上了领奖台。

verb · to keep up one's spirits or show fine mettle, often used to describe the energetic appearance of animals

那匹骏马昂首挺胸，在草原上尽情驰骋。