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The Collaborative International Dictionary of English v.0.48 (gcide)

Swivel \Swiv"el\, n. [AS. sw[imac]fan to move quickly, to
remove; akin to Icel. sveifla to whirl, shake, sv[imac]fa to
ramble, to turn. See {Swoop}, and cf. {Swift} a reel,
{Swift}, a.]
1. (Mech.) A piece, as a ring or hook, attached to another
piece by a pin, in such a manner as to permit rotation
about the pin as an axis.
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2. (Mil.) A small piece of ordnance, turning on a point or
swivel; -- called also {swivel gun}. --Wilhelm.
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{Swivel bridge}, a kind of drawbridge that turns round on a
vertical axis; a swing bridge.

{Swivel hook}, a hook connected with the iron strap of a
pulley block by a swivel joint, for readily taking the
turns out of a tackle.

{Swivel joint}, a joint, the two pieces composing which turn
round, with respect to each other, on a longitudinal pin
or axis, as in a chain, to prevent twisting.
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Swivel \Swiv"el\, v. i.
To swing or turn, as on a pin or pivot.
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