swivel
Concise Oxford English Dictionary © 2008 Oxford University Press:
swivel/ˈswɪvl/
▶noun a coupling between two parts enabling one to revolve without turning the other. ▶verb (swivels, swivelling, swivelled; US swivels, swiveling, swiveled) turn on or as if on a swivel.
– origin ME, from the base of the OE verb swīfan ‘move (along a course), sweep’.
'swivel' also found in these Oxford entries:

