plural balloons
1
: a thin usually rubber bag that becomes larger when it is filled with air or gas
I blew up a balloon but then it burst.
brightly colored balloons and other party decorations
2
: a picture or space in a cartoon that contains words that are spoken or thought by a character
balloons; ballooned; ballooning
: to become bigger quickly
Their credit card debt ballooned to more than $5,000.
His weight ballooned to 300 pounds. = He ballooned to 300 pounds.
the ballooning costs of education
ballooning weight
Cite this Entry
“Balloon.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/balloon. Accessed 16 Apr. 2026.
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