'Part' in the Bible

And she went, and came and took up the heads of grain in the field after the cutters; and by chance she went into that part of the field which was the property of Boaz, who was of the family of Elimelech.

And the near relation said, I am not able to do the relation's part, for fear of damaging the heritage I have: you may do it in my place, for I am not able to do it myself.