Synonyms of 'puff out or up'
▷ See puff
His chest puffed out with pride.
He puffed out his cheeks and let out his breath.
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to swell or cause to swell, as with a liquid, air, or wind
When things such as blood vessels or the pupils of your eyes dilate or when something dilates them, they become wider or bigger.
The pupils dilate to let in more light.
Thesaurus for puff out or up from the Collins English Thesaurus