balloon

US /bəˈluːn/
UK /bəˈluːn/
"balloon" picture
1.

a small, thin rubber bag that is inflated with air or gas until it is round or oval in shape, used as a toy or for decoration

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The child was holding a red balloon.
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We decorated the room with colorful balloons for the party.
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air balloontoy balloon
2.

a large bag filled with heated air or gas to make it buoyant, able to float in the air with a basket for passengers or equipment suspended below

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They took a scenic ride in a hot-air balloon.
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The pilot prepared the hot-air balloon for takeoff.
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hot-air balloonairship
1.

swell out in a spherical shape; puff out

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Her cheeks ballooned when she blew into the trumpet.
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The company's profits ballooned after the successful marketing campaign.
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swellinflateexpandenlargegrow
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trial balloonhot-air balloonthe balloon goes upgo down like a lead balloon