Definition
to expand your chest or cheeks by filling them with air
使（胸膛或臉頰）膨脹
When she heard the news, she couldn't help but puff her cheeks out.
當她聽到這個消息時，她忍不住鼓起了臉頰。
Before the race, he took a deep breath and puffed his chest out proudly.
在比賽前，他深吸了一口氣，自豪地挺起了胸膛。
The children were having so much fun that their cheeks puffed out like little balloons.
孩子們玩得太開心了，臉頰鼓得像小氣球一樣。