belly out
Advanced (C1)neutral
When something puffs out and gets round and big in the middle, like a balloon being blown up.
"The yacht's mainsail bellied out as the wind picked up across the bay."
Hear it in context

Spring Championship Europe & South America
Brawlhalla · 423:19
literally, belly out,

#UFCPerth Watch Along w/ UFC Hall of Famer Jens Pulver
UFC FIGHT PASS · 39:04
He's trying to belly out,

#UFCPerth Watch Along w/ UFC Hall of Famer Jens Pulver
UFC FIGHT PASS · 39:41
Twi is going to belly out.

How To Reduce Stress With Breath Work Techniques
Hey Lady! English Speaking Community · 16:42
So, really ballooning the belly out.
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[Co-Stream] Call of Duty League Major III Qualifiers | Week 3 Day 2
Call of Duty · 319:14
Tries to belly out of the round,