> I'm not planning to retake it unless the school asks. Should I just leave
> it alone or will adcom think I'm ignorant if I dont explain it.
Ths is not a good strategy -- they're far more likely to reject you outright than to ask you to take it again. If you think it's a weakness, then try to take it again (if there's time). I can think of very few cases where a school liked someone so much despite their low score that they admitted them on the condition that they took the GMAT again.
If there's no time, then give it a nod in your optional essay, but don't give the adcomms a litany of excuses. Simply showing how your other academic credentials outweigh your low score should be enough.
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