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Noun: The last uphill before you reach your destination.

Most commonly used by those completing a run, walk, bike ride, or other physical activity.

So named, because it makes you grumble.
"We're almost home! We just have to make it over the grumble and we're there!"

"Oh fuck, I totally forgot this hill was here. I fucking hate the grumble."

"I was doing really well, and then I hit the grumble and I just had to stop and walk it."
by WhenIMetLucy May 24, 2018
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