to boot as well; in addition. informal
☞ Boot here has nothing to do with footwear but comes from an Old English word meaning 'good, profit, or advantage'. It survives for the most part only in this phrase and in bootless meaning 'unavailing or profitless'.
2014JayneOur Great Southern Land I have really got to applaud the builders next door; … they've restumped the house while extending it and have done a bloody ripper of a job to boot.