Concession (3)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">concession</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that sop is a type of concession)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for sop that I've seen before include "Propitiatory gift" , "Concession given to mollify or placate" , "Appeasing gift" , "Piece of bread dipped in liquid, or a concession" , "Propitiatory offering" .)
(Other definitions for trade-off that I've seen before include "Exchange that occurs as a compromise" , "Exchange that is part of a compromise" .)