- a person who abandons or betrays his or her party or associates, especially in a time of trouble.
- an informer.
- a scab laborer.
- to desert one's party or associates, especially in a time of trouble.
- to turn informer; squeal: He ratted on the gang, and the police arrested them.
- to work as a scab.
Idioms about rat
Origin of rat
OTHER WORDS FROM ratrat·like, adjective
How to use rat in a sentence
Each rat had been placed in an enclosed square area with different objects in each corner.
Each has its own “personality” in that it only fires when the animal—mouse, rat, or human—is in a particular spot in space.How Do We Remember Places? This Study Used Lasers and VR to Point the Way|Shelly Fan|November 10, 2020|Singularity Hub
The researchers also found a rebound effect one month after withdrawing the rats from cocaine, with much higher dopaminylation of H3 found in these neurons than in control animals.The Epigenetic Secrets Behind Dopamine, Drug Addiction and Depression|R. Douglas Fields|October 27, 2020|Quanta Magazine
In one experiment, rats were fed food laced with freeze-dried blueberry powder for four weeks.Surviving Mars missions will take planning and lots of innovation|Maria Temming|October 22, 2020|Science News For Students
So, to study how the virus damages the liver, the researchers have turned to a similar virus that infects rats and mice.Hepatitis C discoveries win 2020 Nobel Prize in physiology or medicine|Tina Hesman Saey|October 5, 2020|Science News
Connolly showed that his loyalty was to Winter Hill and not the FBI by ratting out Castucci.
"Ratting seems to have more excuse," the tutor said, and made no sign of a liking for either of those popular pastimes.Lord Ormont and his Aminta, Complete|George Meredith
On a board immediately below the head, was inscribed in front—Behold the ratting lamb, with a cocks comb at his tail.The History of the Catnach Press|Charles Hindley
The hedge is just what it should be, and if it had been made for ratting it could not be better.Studies in the Art of Rat-catching|H. C. Barkley
Bill was wont to boast of the ratting qualities of his dogs at home.The Disputed V.C.|Frederick P. Gibbon
Then you can put me in, and I shall have great pleasure in ratting for a baronetcy.The Weird Sisters, Volume I (of 3)|Richard Dowling
British Dictionary definitions for rat
- to divulge secret information (about); betray the trust (of)
- to default (on); abandonhe ratted on the project at the last minute
Derived forms of ratratlike, adjective
Word Origin for rat
Medical definitions for rat
Other Idioms and Phrases with rat
In addition to the idioms beginning with rat
- rat on
- rat race
- like a drowned rat
- smell a rat