A thick, warm sock worn in bed to keep feet warm at night.
From 'bed' combined with 'sock' (from Old English 'socc'). This is a simple compound created to describe a practical piece of bedtime clothing.
Before central heating, bedsocks were essential winter gear, and Victorian etiquette guides had serious discussions about them—they were so common that they appeared in period photographs and paintings, making them a visual marker of class and climate.
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