Many years ago native American and Canadian tribes were at war. When the war was over, they literally had to BURY a war axe to mark the end of hostilities.
Today we don't use axes a lot (except for chopping the wood, which doesn't happen very often in my family though). However, we still use the idiom BURY THE HATCHET. It means 'to make peace, to settle differences'.
So if you want to stop arguing with someone, you can say:
"I am really sorry, let's stop quarreling, let's BURY THE HATCHET."