mither vs sound off

mither

verb
  • To pester or irritate someone. 

  • To make an unnecessary fuss, moan, bother. 

noun
  • mother 

sound off

verb
  • To hold forth about something in an opinionated manner. 

  • Command instructing a person to confirm that they are present or that some other objective has been met. 

  • Command instructing a person to speak up or acknowledge something. 

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