noun

• (anatomy) The part of the body connecting the head and the trunk found in humans and some animals.
  "Giraffes have long necks."
• (botany) The slender tubelike extension atop an archegonium, through which the sperm swim to reach the egg.
  "Archegonia are surrounded early in their development by the juvenile perianth, through the slender beak of which the elongated neck of the fertilized archegonium protrudes."
• (music) The extension of any stringed instrument on which a fingerboard is mounted
• (engineering) A reduction in size near the end of an object, formed by a groove around it.
  "a neck forming the journal of a shaft"

verb

• (transitive, slang) To hang by the neck; strangle; kill, eliminate.
  "Go neck yourself."
• (intransitive, informal, chiefly US) To intently kiss or cuddle; to canoodle.
  "Alan and Betty were necking in the back of a car when Betty's dad caught them."
• (transitive, slang) To drink or swallow rapidly.
  "Actually, mostly I swan around in my silver sports car, necking drugs, and feeling sorry for myself."
• (intransitive) To decrease in diameter.
  "Since this temperature would place the bolt in its creep range, it will slowly stretch, necking down as it does so. Eventually it will get too thin to support the weight, and the bolt will break."

noun

• (folklore) A shapeshifting water spirit in Germanic mythology and folklore; a nix.
  "The Neck no more upon the river sings. And no Mermaid to bleach her linen flings Upon the waves in the mild solar ray."