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In page Kipper:

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The word is thought to derive from the Old English cypera, or copper, based on the colour of the fish.[1] The word has various possible parallels, such as Icelandic kippa which means "to pull, snatch" and the Germanic word kippen which means "to tilt, to incline". Similarly, the Middle English kipe denotes a basket used to catch fish. Another theory traces the word kipper to the kip, or small beak, that male salmon develop during the breeding season.[citation needed]