Disappoint (4)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">disappoint</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that fail is a more specific form of the action disappoint)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for fail that I've seen before include "Stop working properly" , "Fall short" , "Break down" , "Don't succeed" , "Go wrong" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">disappoint</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for let down that I've seen before include "Disappoint, fail to support" , "Leave in the lurch" , "blow" , "Lower" , "Failed - to deflate a tyre - disappointed" .)