To bury the hatchet

This comes from the American custom of burying hawks and other weapons as a sign that hostilities between the American Indians and the White had ended. Nowadays, this idiom is used to refer to coming to peaceful terms with an opponent.

Custom = costumbre

To bury = enterrar

Hawk = hacha

Weapons = armas

Sign = símbolo, señal

To come to peaceful terms = hacer las paces

Opponent = enemigo, contrario