ratter

名词 ratter:

1. a disloyal person who betrays or deserts his cause or religion or political party or friend etc.
   同义词：deserter, apostate, renegade, turncoat, recreant
2. any of several breeds of terrier developed to catch rats
   同义词：rat terrier

rat.ter

n.（名词）
One that catches or kills rats:
捕鼠者：捕捉或猎杀老鼠的人或动物：
例句：
Many terriers are good ratters.
很多狗是很好的捕鼠动物

Slang One who betrays or deserts another.
【俚语】 出卖他人者，抛弃他人者