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to boot

to boot idiom

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]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.