Emily Dickinson Lexicon

BOOT, n.¹

1. Profit; gain; advantage; that which is given to make the exchange equal, or to supply the deficiency of value in one of the things exchanged. – Shak.
2. To boot, in addition to; over and above; besides; a compensation for the difference of value between things bartered; as, I will give my house for yours, with one hundred dollars to boot. [Sax. to bote. The phrase is pure Saxon.]
3. Spoil; plunder. [See Booty.] – Shak.