Noun ratter has 2 senses
  1. deserter, apostate, renegade, turncoat, recreant, ratter - a disloyal person who betrays or deserts his cause or religion or political party or friend etc.
    --1 is a kind of quitter
    Derived forms: verb rat6, verb rat2, verb rat3, verb rat1
  2. rat terrier, ratter - any of several breeds of terrier developed to catch rats
    --2 is a kind of terrier
    --2 has particulars: Manchester terrier, black-and-tan terrier
    Derived form: verb rat5
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