rat

US /ræt/
UK /ræt/
"rat" picture
1.

a rodent larger than a mouse, typically having a pointed snout and a long, hairless tail.

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A large rat scurried across the alley.
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The old building was infested with rats.
:
rodent
2.

a person who deserts their friends or associates, especially in a time of trouble.

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He's a real rat for abandoning his team when they needed him most.
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Don't trust him, he's a known rat.
:
traitorinformerdesertersnitchfink
1.

to betray someone or inform on them.

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He threatened to rat on his accomplices if he got caught.
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Don't rat me out to the boss!
:
betrayinformsnitchfinksqueal
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rat ondassie ratwater ratpack ratmole ratkangaroo ratbeaver rat