choker

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun One that chokes or suffocates another.
• noun Something that fits closely around the neck or throat, as.
• noun A tight-fitting necklace.
• noun A high, tight collar.
• noun A narrow neckpiece of fur.

from The Century Dictionary.

• noun In lumbering, a noose of wire rope by which a log is dragged.
• noun One who or that which chokes; that which induces a feeling of strangulation; something difficult to swallow.
• noun That which puts another to silence; that which cannot be answered.
• noun A neckcloth: as, “a white choker,”
• noun In milit. engin., a chain with wooden staves attached to the ends, employed to compress and measure the circumference of fascines.

from the GNU version of the Collaborative International Dictionary of English.

• noun One who, or that which, chokes.
• noun Slang A stiff wide cravat; a stock.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A piece of jewelry or ornamental fabric, worn as a necklace, tight to the throat.
• noun One who, or that which, chokes or strangles.
• noun One who operates the choke of an engine during ignition.
• noun slang Any disappointing or upsetting circumstance.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun someone who kills by strangling
• noun a high tight collar
• noun an unfortunate person who is unable to perform effectively because of nervous tension or agitation
• noun necklace that fits tightly around a woman's neck