Tidal wave (4)
(Another definition for eger that I've seen is " bore".)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">tidal wave</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for tsunami that I've seen before include "Huge wave caused by earth tremor" , "Marine natural disaster" , "Destructive tidal wave" , "Strong surge" , "stormy sea" .)