Saturate, drench (4)
I believe the answer is:
soak
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">saturate</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >'<span class="explanation-format__original">drench</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ ></span>
(Other definitions for soak that I've seen before include "Immerse in liquid" , "Steep in water" , "Make extremely wet" , "Saturate" , "Marinate" .)