A device designed to heat your feet, such as a heated pad, hot water bottle, or electric blanket placed at the foot of a bed.
Compound of 'foot' + 'warmer' (something that makes warm). Emerged in the Victorian era to describe practical heating devices used before central heating existed.
Before electricity, footwarmers were ceramic or metal containers filled with hot water or coals—families would heat them in fireplaces and pass them under blankets, making them precious items on winter nights!
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