Increased, ballooned (4)
I believe the answer is:
grew
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">increased</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(growing is a kind of increasing)</span><br/ ><br/ >'<span class="explanation-format__original">ballooned</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ ></span>
(Other definitions for grew that I've seen before include "Cultivated'" , "Sprouted" , "Expanded - flourished" , "Became larger" , "Multiplied" .)