puff out one's chest 挺起胸膛
puff out cheeks 鼓起脸颊
puff out smoke 喷出烟雾
1. He puffed out his chest with pride.
他自豪地挺起了胸膛。
2. The bird puffed out its feathers to look larger.
那只鸟蓬起羽毛使自己看起来更大。
3. Smoke puffed out from the chimney.
烟从烟囱里冒了出来。
A: Why are you puffing out your cheeks?
A：你为什么要鼓起脸颊？
B: I am just trying to hold my breath.
B：我只是想憋一会儿气。
1) 使膨胀或鼓起
2) 喷出或吹出（烟、气等）
1. 使膨胀，使鼓起
e.g.
Steam puffed out from the kettle.
蒸汽从水壶里冒了出来。
phrasal verb
1. To cause something to swell or expand, or to make something bulge out.
Synonym: swell, expand