Interpret mouth movements (3-4)
I believe the answer is:
lip-read
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">interpret mouth movements</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 lip-read that I've seen before include "Interpret someone''s words when deaf" , "Understand by watching (a person) speak" , "Dire pal can interpret mouth movements as words" , "Understand without hearing" , "How to "hear" when deaf" .)