rat

noun1 of 2

an animal that looks like a large mouse

• “Your dog looks more like a rat than a dog.”Tatoeba
• “Those who are afraid of cats were rats in another life.”Tatoeba

Sentences from Tatoeba show real usage. A word can have several meanings, so a sentence may use another one.

verb2 of 2

(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.