to boot

From Middle English to bote (“something added to, addition”), from Old English tō bōte (“to boot, besides, moreover”). See boot (“profit, gain, remedy”).

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to boot (not comparable)

1. (idiomatic, informal) In addition, besides, also.

   My boyfriend is funny, and a pretty good cook to boot.

   • 1606, Caius [i.e., Gaius] Suetonius Tranquillus, “The Historie of Caius Iulius Cesar Dictator”, in Philêmon Holland, transl., The Historie of Twelve Cæsars Emperours of Rome. […], London: […] [Humphrey Lownes and George Snowdon] for Matthew Lownes, →OCLC, section 38, page 16:

     Among the people (of Rome) beſide x. modij of corne, & as many pints of oyle, he diſtributed & dealt 300 Seſterces alſo by the poll, vvhich hee had in times paſt promiſed, vvith an overdeale of 100. a peece to boote, for time.

Almost always placed in clause-final position; compare on top of that.

• into the bargain
• on top of that