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n. One that catches or kills rats: Many terriers are good ratters.

n. Slang One who betrays or deserts another.

n. Anything which catches rats, especially a dog trained to catch them; a rat terrier.

n. One who rats; a traitor; a deserter.

n. One who, or that which, rats, as one who deserts his party.

n. Anything which catches rats; esp., a dog trained to catch rats; a rat terrier. See Terrier.

n. One who catches rats; a rat-catcher.

n. An animal which catches rats, as a terrier.

n. One who rats, or becomes a renegade; also, a workman who renders himself obnoxious to a trades-union. See ratting, 2.

n. any of several breeds of terrier developed to catch rats

n. a disloyal person who betrays or deserts his cause or religion or political party or friend etc.

""ratter" -- superstitious Tudor sailors did not have cats on board as they were thought to bring bad luck."

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