Acerbic (4)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">acerbic</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for acid that I've seen before include "Bitter or sour" , "Alkali's opposite" , "Bitter substance" , "scathing" , "Corrosive liquid; drug" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">acerbic</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 vinegary that I've seen before include "Acerbic" , "Sour tasting" , "bitter" , "Peevish" .)