collar, neckband -- (a band that fits around the neck and is usually folded over)
collar -- ((zoology) an encircling band or marking around the neck of any animal)
collar -- (anything worn or placed about the neck; "the thief was forced to wear a heavy wooden collar"; "a collar of flowers was placed about the neck of the winning horse")
collar -- (a short ring fastened over a rod or shaft to limit, guide, or secure a machine part)
collar, shoe collar -- (the stitching that forms the rim of a shoe or boot)
collar -- (a band of leather or rope that is placed around an animal's neck as a harness or to identify it)
collar, leash -- (a figurative restraint; "asked for a collar on program trading in the stock market"; "kept a tight leash on his emotions"; "he's always gotten a long leash")