'Keep' in the Bible

Would you keep yourselves till they were old enough? would you keep from having husbands for them? No, my daughters; but I am very sad for you that the hand of the Lord is against me.

Then said Boaz to Ruth, Give ear to me, my daughter: do not go to take up the grain in another field, or go away from here, but keep here by my young women:

Keep your eyes on the field they are cutting, and go after them; have I not given orders to the young men not to put a hand on you? And when you are in need of drink go to the vessels and take of what the young men have put there.

And Ruth the Moabitess said, Truly, he said to me, Keep near my young men till all my grain is cut.

Then Boaz said, On the day when you take this field, you will have to take with it Ruth, the Moabitess, the wife of the dead, so that you may keep the name of the dead living in his heritage.

And, further, I have taken Ruth, the Moabitess, who was the wife of Mahlon, to be my wife, to keep the name of the dead man living in his heritage, so that his name may not be cut off from among his countrymen, and from the memory of his town: you are witnesses this day.