Fig.: to make peace or call a truce; to end a dispute; to settle an argument

The two neighbors kept arguing and fighting for a long time, until one day they decided to bury the hatchet once and for all. They don't love each other to death, but at least they live in peace

I due vicini hanno continuato a litigare per un sacco di tempo, finché, un giorno, hanno finalmente deciso di seppellire l'ascia di guerra una volta per tutte. Ora non si amano alla follia, ma almeno vivono in pace

I know we had our divergences in the past, but now we have to work together so let's bury the hatchet and go on with our new job

So benissimo che abbiamo avuto molte divergenze in passato, ma visto che ora dobbiamo lavorare assieme, seppelliamo l'ascia di guerra e cominciamo il nuovo lavoro

Some North American Indian tribes would declare peace by actually burying tomahawks, hatchets and other war weapon to show that the fighting was over. This custom was first described by Samuel Sewell in 1680 and by the 1800s had acquired the broader meaning of settling any kind of dispute