n. & v.
--n. a coupling between two parts enabling one to revolve without turning the other.
--v.tr. & intr. (swivelled, swivelling; US swiveled, swiveling) turn on or as on a swivel.
Phrases and idioms:
swivel chair a chair with a seat able to be turned horizontally.
Etymology: ME f. weak grade swif- of OE swifan sweep + -LE(1): cf. SWIFT