Rat

1. (noun) A medium-sized rodent belonging to the genus Rattus. 2. (noun) Any of the numerous members of several rodent families (e.g. voles and mice) that resemble true rats in appearance, usually having a pointy snout, a long, bare tail, and body length greater than about 12 cm, or 5 inches. 3. (noun) A person who is known for betrayal; a scoundrel; a quisling. 4. (noun) An informant or snitch. 5. (noun) A scab: a worker who acts against trade union policies. 6. (noun) A person who routinely spends time at a particular location. 7. (noun) A wad of shed hair used as part of a hairstyle. 8. (noun) A roll of material used to puff out the hair, which is turned over it. 9. (noun) Vagina. 10. (noun) Short for muskrat. 11. (verb) (usually with “on” or “out”) To betray a person or party, especially by telling their secret to an authority or an enemy; to turn someone in. 12. (verb) To work as a scab, going against trade union policies. 13. (verb) (of a dog, etc.) To kill rats.