What is "for best"

Best \Best\, n. Utmost; highest endeavor or state; most nearly perfect thing, or being, or action; as, to do one's best; to the best of our ability. At best, in the utmost degree or extent applicable to the case; under the most favorable circumstances; as, life is at best very short. For best, finally. [Obs.] ``Those constitutions . . . are now established for best, and not to be mended.'' --Milton. To get the best of, to gain an advantage over, whether fairly or unfairly. To make the best of.

1. To improve to the utmost; to use or dispose of to the greatest advantage. ``Let there be freedom to carry their commodities where they can make the best of them.''
   --Bacon.

2. To reduce to the least possible inconvenience; as, to make the best of ill fortune or a bad bargain.

adv. (context obsolete English) for good; permanently