Crossword Genius

Swell (7)

Ross

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3 5 6

7

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">swell</span>' is the definition.<br/ ><span class="explanation-format__explanation">(both can mean to expand or increase)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(Other definitions for balloon that I've seen before include "Air-filled bag" , "Swell, increase rapidly" , "Inflatable rubber bag, could be filled with hot air" , "Inflatable - rapidly expand" , "Air transport" .)

I've seen this clue in the Sydney Morning Herald, the Evening Standard, The Telegraph, The Sun and the Penny Press.
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