Bury the Hatchet
Make Peace
OK, so this one should be no great mystery. For years before the Europeans came to the New World native tribes would conclude their peace treaties with the practice of burying axes or other weapons to signify a truce. Though most likely they would have used the term tomahawk. As the men from the Old World came they observed the tradition and coined the phrase.
In an interesting side note. The tribal gatherings the led to the “burying of the hatchet” were called pow-wows by the Europeans. This phrase stemmed from the word po’wah. That term actually was the title given to the medicine man that was in charge of the peach talks, not the talks themselves.