'Half tribe' in the Bible

The remainder of Gilead and Bashan of the kingdom of Og, I've given to the half-tribe of Manasseh. (The whole region of Argob that is, all of Bashan is called the land of the Rephaim.)

“Then I commanded you [Reuben, Gad, and the half-tribe of Manasseh] at that time, saying, ‘The Lord your God has given you this land to possess; all you who are brave men shall cross over [the Jordan] armed before your brothers, the sons of Israel.

and we took their land and gave it as an inheritance to the Reubenites, the Gadites, and the half-tribe of the Manassites.