Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English


English definition of “rat”


noun [C]     /ræt/
ANIMAL A2 an animal that looks like a large mouse and has a long tail : Rats carry disease .Rodents and similar animals
PERSON informal an unpleasant , dishonest person Cheating and trickingPlotting and trappingUnpleasant menUnpleasant people in generalDishonest peopleLies, lying and hypocrisyCheating and tricking
(Definition of rat noun from the Cambridge Learner's Dictionary © Cambridge University Press)

More Learner's Dictionary definitions for “rat”

Definitions of “rat” in other dictionaries

Word of the Day


a skilled and trained cook who works in a hotel or restaurant, especially the most important cook

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More