Etymology From Middle English segge, from Old English seċġ (“man, warrior, hero”), from Proto-West Germanic *sagi, from Proto-Germanic *sagjaz (“follower, retainer, warrior”), from Proto-Indo-European *sekʷ- (“to follow, accompany”). Cognate with Norwegian segg, Icelandic seggur (“bully”).
[…] when a prisoner is transferred or paroled or sent to "seg" (segregation) or hauled back into court, they don't ask if he's busy with a lead role in a play.1988 July 15, Albert Williams, “Prison Drama”, in Chicago Reader:
Derived terms
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seg
noun
Etymology Genericized trademark of Blakey's Segs, a British brand of shoe protector. Formed as an apocopic form of (steel) segment.
1
UK A shoe protector (metal stud or plate affixed to the sole or heel of a shoe to prevent excessive wear).
In one district of Stronsa, I observed several acres covered with the common yellow flag, or seg (iris pseudacorus,) of which a very coarse kind of hay is here made.1805 January, “Observations made in a Tour through parts of Orkney and Shetland in 1894”, in The Scots Magazine and Edinburgh Literary Miscellany, volume 67, number 1, page 26:
It's also believed that anyone who bites a seg will develop an impediment of speech, such as a stammer.2019, Roy Vickery, Vickery's Folk Flora, page lxxiii:
1 more example
Boats were made of wood, paper or segs (the leaves of the yellow flag). For some reason, children in Stenness (O) were warned that if they chewed seg leaves they would become dumb.2020, Ernest Marwick, The Folklore of Orkney and Shetland: