Due, n. 1. That which is owed; debt; that which one contracts to pay, or do, to or for another; that which belongs or may be claimed as a right; whatever custom, law, or morality requires to be done; a fee; a toll.
He will give the devil his due. Shak.
Yearly little dues of wheat, and wine, and oil. Tennyson.
2. Right; just title or claim.
The key of this infernal pit by due... I keep. Milton.