chirp vs sound off

chirp

verb
  • To speak in a high-pitched staccato. 

  • To make a short, sharp, cheerful note, as of small birds or crickets. 

  • To modify (a pulse of signal) so that it sweeps through a band of frequencies throughout its duration. 

  • To speak rapid insulting comical banter back and forth. 

noun
  • A pulse of signal whose frequency sweeps through a band of frequencies for the duration of the pulse. 

  • A short, sharp or high note or noise, as of a bird or insect. 

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 chirp and sound off occurred in a corpus of books? (source: Google Ngram Viewer )