Lose consciousness (4,3)
I believe the answer is:
pass out
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">lose consciousness</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for pass out that I've seen before include "Complete one's training" , "Become unconscious" , "In the army, do so having proved ready" , "Faint - finish military training" , "Swoon" .)