To deliberately ignore someone or treat them in an unfriendly, dismissive manner. It means showing intentional coldness or rejection toward another person.
This phrase has disputed origins, but one theory traces it to medieval hospitality customs where honored guests received hot meals while unwelcome visitors were served cold shoulder of mutton - a clear sign they weren't welcome to stay long. Another theory suggests it simply refers to turning one's shoulder away from someone.
Whether the medieval meat story is true or not, the phrase brilliantly captures the physical gesture of rejection - turning your shoulder toward someone literally presents them with your 'cold' side rather than your warm, welcoming face. The body language perfectly matches the emotional temperature of the interaction.
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