(a) a fixed route on which milk is regularly collected from farmers or delivered to customers; a milk delivery business covering such routes; (b) =…

A regular journey taken along a fixed route as part of one's job, typically incorporating several stops, esp. in order to make deliveries; (also)…

(a) = milk round n. (a); (b) colloquial a routine trip or service, usually involving calls at several places, esp. an early morning train or…