Bursts out (6)
I believe the answer is:
erupts
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">bursts out</span>' is the definition.<br/ ><span class="explanation-format__explanation">('erupt' can be a synonym of 'burst out')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for erupts that I've seen before include "Explodes" , "Bursts" , "Breaks out suddenly" , "loses temper?" , "Blows up like volcano" .)