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milk run

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noun Slang.
  1. a routine trip or undertaking, especially one presenting little danger or difficulty: The flight from New York to Chicago was a milk run for the experienced pilot and crew.
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Origin of milk run

First recorded in 1940–45
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for milk run

milk run

noun
  1. aeronautics informal a routine and uneventful flight, esp on a dangerous mission
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Word Origin

C20: referring to the regular and safe routine of a milkman's round
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012