ratter

1. He likes abandoned buildings. caesar's a ratter.
   他喜欢荒废的房子，凯萨喜欢抓老鼠。
2. The other people called him a ratter in the backward.
   别人背后骂他无赖。

noun

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

   Synonym:    rat terrier

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

   Synonym:    deserterapostaterenegadeturncoatrecreant