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Besides, in addition. For example, It rained every day and it was cold to boot, or He said they'd lower the price of the car by $1,000 and throw in air conditioning to boot. This expression has nothing to do with footwear. Boot here is an archaic noun meaning “advantage,” and in the idiom has been broadened to include anything additional, good or bad. [c. a.d. 1000]
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
