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The word jam means "to press tightly," or "to become wedged" It was first used in 1706. It is often associated with the word identifying the material which is jammed - a log jam for floating logs, an ice jam for ice in a river, a paper jam in a printing press or copying machine, and a traffic jam for vehicles on a road.

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10y ago
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15y ago

When there is so much traffic in the one place that getting anywhere takes a long time.

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Q: Why is a traffic jam called a traffic jam?
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