the.com/milk float

means A small electric vehicle used, traditionally in Britain, for delivering milk and other dairy products door-to-door, typically early in the morning.

from A straightforward compound: 'milk' plus 'float,' an old term for a low, flat-bedded cart or carriage. 'Float' had been used since the 19th century for horse-drawn delivery drays, and when electric versions replaced horses in British dairy delivery in the 20th century — prized for their quiet motors suited to pre-dawn rounds — the name simply carried over to the new battery-powered carts.