A 'hatchet' is a disagreement. So, you bury it so that it doesn't emerge again. It does sometimes give the impression that the parties are not entirely happy but mutually forget this particular problem. Example: 'The sisters fell out over their mother's will but agreed to bury the hatchet after consulting legal advice'.
It's an anlgo-american slag term for making peace. This stems from the fact that when American Indian tribes came to peace, they would literally "bury the hatchet" to signify the event.
It means to drop all animosity, disagreement, even perhaps hate concerning another individual for some past aggravation and adopt a normal relationship.
Forgive and Forget
Forget the past
Yes
It is not an idiom, it means your nose is itching.
It's not really an idiom. It means "what are you thinking about."
RFP is not an idiom. It's an abbreviation.
Tammy
Well, think about that for a minute. Do you think people really bury their feet like they're planting a tree?
bury their parents alive
"Sieve" is not an idiom. See the related link.
It's not an idiom. It means the tip of your nostril.
idiom means expression like a page in a book