Forgive and forget (3,2,2)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">forgive and forget</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for let it go that I've seen before include "Hit song from Disney's 2013 animated feature film Frozen" , "Refrain from comment" , "Excuse something" , "Disney tune" .)
(Other definitions for let bygones be bygones that I've seen before include "not being able to revalue old artefacts" , "Be reconciled" .)