rat
Pronunciation
/ræt/

Definition & Meaning of "rat"in English

Rat
01

a large mouse-like animal with a long tail, which spreads diseases

rat definition and meaning
Grammatical Information
Animacy status
Animal
Composition
Simple
Countable
Plural form
rats

What is a "rat"?

Rats are medium-sized rodents known for their adaptability and widespread distribution. They have pointed snouts, large ears, and long tails. Rats come in various species and colors, and they are found on every continent except Antarctica. Rats are known for their intelligence, agility, and ability to thrive in a wide range of habitats, including urban areas. They are typically omnivorous, feeding on a variety of foods, including grains, fruits, vegetables, and sometimes insects or small animals. Rats are known for their rapid reproduction, and they can reproduce quickly and have large litters. Rats have been both vilified as pests due to their ability to damage crops and spread disease, as well as praised for their contributions to scientific research and as pets in some cultures.

Examples
The rat scurried along the alley, searching for scraps of food.
02

a person considered treacherous, despicable, or contemptible

rat definition and meaning
Offensive
Slang

What is the origin of the term "rat" and how is it used?

"Rat" as an insult dates back several centuries, drawing on the negative reputation of rats as dirty, sneaky, and destructive animals that live among human spaces. By metaphor, it came to describe a person considered treacherous, despicable, or contemptible, emphasizing moral lowliness or unpleasant character rather than specifically informing on others. The term is used in informal speech across English-speaking countries, often in anger or condemnation. It is clearly derogatory but not vulgar, targeting a person's character and behavior rather than being strongly offensive language.

Examples
He felt betrayed by a rat in the office.
03

a pad, typically made of hair, worn to add volume to a woman's hairstyle

Examples
She inserted a rat to lift her hairstyle for the party.
04

someone who works or provides replacement workers during a strike

What is the origin of the term "rat" and how is it used?

"Rat" as a labor-related insult dates back to the late 19th century, drawing on the long-standing association of rats with betrayal, treachery, and disloyal behavior. In trade union contexts, it came to describe someone who works during a strike or provides replacement labor, implying they are undermining solidarity and acting selfishly against the group. The term has been used in union rhetoric, picket lines, and political speech, especially in industrial disputes. It is clearly derogatory within labor movements, though its offensiveness depends on one's stance toward strikes and unions.

Examples
Strikers accused the man of being a rat.
05

someone who gives information about other people and their crimes or wrongdoings to the police or authorities

Slang

What does "rat" mean in street and prison slang?

It is used to describe someone who gives information about other people and their crimes or wrongdoings to the police or authorities, often considered even worse than a "snitch" in some subcultures. People typically call someone a "rat" as a severe insult, implying disloyalty, cowardice, and worthlessness, with the term carrying an especially heavy stigma in prison culture where rats may face violence. The term originated in early 20th century American criminal slang, drawing from the rat's reputation as a sneaky, untrustworthy creature, and remains common in hip hop lyrics, gang culture, and crime fiction.

Examples
The criminal gang was furious when they discovered there was a rat in their midst.
to rat
01

to use a hair pad to add volume or fullness to a hairstyle

Grammatical Information
Composition
Simple
Action verb
Regular
Present tense
rat
3rd person singular
rats
Present participle
ratting
Past simple
ratted
Past participle
ratted
Examples
She rats her hair before attending the gala.
02

to abandon or betray one's friends, group, or party for personal gain

Examples
He rats on his teammates to secure a promotion.
03

to take the place of someone who is on strike, performing their work

Examples
He rats during the labor strike at the factory.
04

to employ strikebreakers to replace striking workers

Examples
The factory rats the production lines during the strike.
05

to inform on someone or betray them, often by disclosing their wrongdoing to authorities

Examples
He decided to rat on his accomplices to get a reduced sentence.
06

to hunt or catch rats, often using dogs trained for the purpose

Examples
The farmer rats around the barn every morning.
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