Crossword Genius

Increase rapidly (7)

Ross

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4

7

8

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">increase rapidly</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for balloon that I've seen before include "Inflatable rubber bag, could be filled with hot air" , "Become inflated" , "In which Charlie Brown expressed himself" , "Brandy glass" , "Bag filled with gas or air" .)

I've seen this clue in The Times, The Sun and The Wall Street Journal.
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