E. Cobham Brewer 1810–1897. Dictionary of Phrase and Fable. 1898.
Boot.
I will give you that to boot, i.e. in addition. The Anglo-Saxon boot or bt means “compensation.” (Gothic, bôta, profit.)
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“As anyone shall be more powerful … . or higher in degree, shall he the more deeply make boot for sin, and pay for every misdeed.”—Laws of King Ethelred.
t means “compensation.” (Gothic, bôta, profit.)
