Definitions
1.nounA medium-sized rodent belonging to the genus Rattus.
2.nounAny 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.nounA person who is known for betrayal; a scoundrel; a quisling."What a rat, leaving us stranded here!"
4.nounAn informant or snitch.
5.nounA scab: a worker who acts against trade union policies.
6.nounA person who routinely spends time at a particular location."He loved hockey and was a devoted rink rat."
7.nounA wad of shed hair used as part of a hairstyle.
8.nounA roll of material used to puff out the hair, which is turned over it.
9.nounVagina."Get your rat out."
10.nounShort 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."He is going to rat us out!"
12.verbTo work as a scab, going against trade union policies.
13.verb(of a dog, etc.) To kill rats.
14.nounA scratch or a score.
15.nounA place in the sea with rapid currents and crags where a ship is likely to be torn apart in stormy weather.
16.verbTo scratch or score."He ratted a vertical line on his face with a pocket knife."
17.verbTo tear, rip, rend."Ratted to shreds."
18.verbDamn, drat, blast; used in oaths.
19.nounA ration.
20.interjectionExpression of annoyance or disgust; damn, darn.
21.interjectionExpression of disbelief.