ballon

US /ˈbæl.ən/
UK /ˈbæl.ən/
"ballon" picture
1.

a bag made of thin rubber or other flexible material, inflated with air or gas and used as a toy or for decoration.

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The child was holding a red balloon.
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They decorated the room with colorful balloons for the party.
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airbagbladderbubblefloat
2.

a large bag filled with heated air or gas to make it float in the air, typically carrying a basket for passengers.

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They took a ride in a hot-air balloon over the valley.
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The pilot prepared the balloon for takeoff.
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airshipdirigible
1.

to swell out in a spherical shape; to inflate.

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The fabric ballooned out in the strong wind.
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His cheeks ballooned as he blew into the trumpet.
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swellinflateexpandbillowpuff up
2.

to increase rapidly in amount or size.

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The company's debts ballooned after the failed investment.
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Costs for the project have ballooned beyond initial estimates.
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soarescalatesurgeskyrocketmushroom