Her cheeks puffed up when she blew out the candles on her birthday cake.
balloon
Frequency:
50
%
The balloon puffed up as it was filled with air.
pillows
Frequency:
45
%
She fluffed up the pillows before sitting down on the couch.
Idiomatic Expressions for puff up
Phrase: puff up like a blowfish
Meaning: to become swollen or inflated, like a blowfish, often due to anger or pride
Usage: She puffed up like a blowfish when he insulted her in front of everyone.