What does rat mean?

Looking for the meaning or definition of the word rat? Here's what it means.

  1. (zoology) A medium-sized rodent belonging to the genus Rattus.
  2. (informal) A term indiscriminately applied to numerous members of several rodent families (e.g. voles and mice) having bodies longer than about 12 cm, or 5 inches.
  3. (informal) A person who is known for betrayal; a scoundrel; a quisling.
  4. (informal) An informant or snitch.
  5. (slang) A person who routinely spends time at a particular location.
  6. Scab.
  7. A wad of shed hair used as part of a hairstyle.
  1. (usually with “on” or “out”) To betray someone and tell their secret to an authority or an enemy; to turn someone in, bewray.
  2. (of a dog, etc.) To kill rats.
  1. (regional) A scratch or a score.
  2. (nautical, regional) A place in the sea with rapid currents and crags where a ship is likely to be torn apart in stormy weather.
  1. (regional) To scratch or score.
  2. (regional, rare, obsolete) To tear, rip, rend.
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