bottle cap

noun

a device for closing or sealing a bottle, especially a metal cover with a cork gasket fitting tightly over the mouth of a glass or plastic bottle, held in place by crimping the edge of the cap over the lip or flange of the bottle.

An Americanism dating back to 1925–30

And most recently, Maddie Bradshaw created the Snap Caps bottle cap necklace when she was 10.

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