Choose not to participate (3,3)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">choose not to participate</span>' is the definition.<br/ ><span class="explanation-format__explanation">(to opt out of something is to choose not to do it)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for opt out that I've seen before include "Decide not to participate" , "Choose to be excluded" , "Choose not to participate" , "Decline to participate" , "Choose not to do something" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">choose not to participate</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for abstain that I've seen before include "Refrain from doing something" , "Cut it out!" , "Deny oneself" , "Choose not to do something" , "Refrain (from drink)" .)