Say the same thing as
I believe the answer is:
echo
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">say the same thing as</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for echo that I've seen before include "Audio effect" , "Repeat or reverberate" , "Radio operator's word for 'E'" , "Reflected sound" , "Rebounding sound" .)