A metal framework with springs that is attached under a mattress to provide support and cushioning when you sleep.
From bed + spring. 'Spring' refers to the coiled metal that bounces back. This compound word emerged in the 1800s when coil springs were first used in mattress technology to replace straw and feathers.
The invention of bedsprings around 1850 was genuinely revolutionary for sleep—before that, people slept on straw, feathers, or rope, and a good night's rest was something only the wealthy could afford.
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