merrow vs serge

merrow

verb
  • To overlock. 

noun
  • A merman or mermaid in Scottish and Irish Gaelic folklore. 

serge

verb
  • To overlock. 

noun
  • A type of worsted cloth. 

  • A garment made of this fabric. 

  • A large wax candle used in some church ceremonies. 

How often have the words merrow and serge occurred in a corpus of books? (source: Google Ngram Viewer )