The trunk or rear compartment of a car, especially as used in a car boot sale (British term for a garage sale).
A compound of 'cart' (from Latin carrus) and 'boot' (British English term for automobile trunk, from an Old English root related to 'foot'), used primarily in British English.
The British word 'boot' for the car trunk probably comes from a type of luggage called a 'boot' that hung on the back of old carriages—so 'cartboot' is a wonderfully literal description of what modern cars still do: hang storage on their rear.
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