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1. One that catches or kills rats: Many terriers are good ratters.
2. Slang One who betrays or deserts another.
a rat-catching animal.
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|Noun||1.||ratter - a disloyal person who betrays or deserts his cause or religion or political party or friend etc.|
quitter - a person who gives up too easily
|2.||ratter - any of several breeds of terrier developed to catch rats|
terrier - any of several usually small short-bodied breeds originally trained to hunt animals living underground