Rebounds or springs back after hitting a surface. In email context, refers to messages that are returned as undeliverable.
Middle English 'bunsen' meaning 'to thump,' possibly from Dutch 'bonzen.' The modern sense of springing back developed in 16th century, with email 'bounce' emerging in 1990s computing.
The physics of bouncing reveals fascinating properties - a perfectly elastic bounce would return a ball to its original height, but real-world energy loss means every bounce gets smaller, creating the mesmerizing diminishing rhythm we see in dropping balls.
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