Exhale audibly (4)

I believe the answer is:
sigh
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">exhale audibly</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for sigh that I've seen before include "expire, sadly" , "Weary sound" , "Audible exhalation of breath" , "Utterance made by exhaling audibly" , "Moan softly" .)