How to use "rat" in a sentence

When Valjean was outside, Thenardier closed the gate behind him and disappeared, like a rat, into the darkness of the sewers.

"Evidently they think someone from Project Pandora has decided to rat on them."

"You don't want to rat on whoever it was

If I see a rat, you won't stop the boat so I can run after it

After a while, he returned with a dead rat in his mouth

Harris said, 'It's all right to add the dead rat