Real Dictionary

swivel
ergative verb: If your head or your eyes swivel in a particular direction or if you swivel them in a particular direction, you quickly look in that direction.
verb: If something swivels or if you swivel it, it turns around a central point so that it is facing in a different direction.
verb: If you swivel in a particular direction, you turn suddenly in that direction.

swivel in American English
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
to cause to turn or rotate on or as if on a swivel
to turn on or as if on a swivel
intransitive verb: to turn on or if as on a swivel
noun: a fastening device that allows the thing fastened to turn around freely upon it, esp. to turn in a full circle
transitive verb: to turn or pivot on or as if on a swivel

swivel in British English
noun: a coupling device which allows an attached object to turn freely
verb: to turn or swing on or as if on a pivot