the.com/high ground

means The superior position—literal elevation in a landscape or figurative moral/strategic advantage in an argument or conflict—that gives whoever holds it a clear edge over everyone below.

from Rooted in literal military geography: armies have fought for hilltops and ridgelines since warfare began, because height gives you sightlines, range, and the advantage of gravity when the fighting turns close. The phrase marched into politics and everyday argument as a metaphor sometime in the modern era, with 'take the high ground' and 'moral high ground' becoming fixed idioms — the moral sense borrowing the same logic: whoever stands above the fray is harder to attack and sees further than those still down in the mud.