Swivel mentioned as meaning a fetter or manacle. Not clear how it meant that.

"swivel - frequentive form from stem of O.E. swifan "to
move in a course, sweep" (a class I strong verb), from
P.Gmc. *swipanan, from I.E. base *swei- "swing, bend,
move in a sweeping manner." M.E. swive was the principal
slang for "to have sexual intercourse."

swivel
n.
ME swiuel < base of OE swifan, to revolve, turn: for IE base see SWIFT6 a coupling device that allows free turning of the parts attached to it; specif., a chain link made in two parts, one piece fitting like a collar below the bolt head of the other and turning freely about it
vt.
3eled or 3elled, 3el[ing or 3el[ling
1 to cause to turn or rotate on or as if on a swivel
2 to fit, fasten, or support with a swivel
vi.
to turn on or as if on a swivel

We had a half dozen posts about "swivel chairs" and "necks swivelling"
Both seem quite a departure from early meaning.