E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Tomahawk.
A war-hatchet. The word has slight variations in different Indian tribes, as tomehagen, tumndhagen, tamoihecan, etc. When peace was made between tribes in hostility, the tomahawks were buried with certain ceremonies; hence, to bury the hatchet means to make peace.