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Definitions of milk run:
noun: A routine trip, especially one involving several stops
noun: (logistics) The collection of mixed loads from multiple fixed sources on a regular basis.
noun: (military, slang) An uneventful mission, especially a military sortie completed without incident
noun: (politics, slang) A campaign for a political office whose main apparent purpose is to "milk" money from supporters in order to provide a source of income for the candidate, campaign staff, and family members.