dring vs thring

dring

verb
  • To press; squeeze; crowd; push. 

noun
  • A throng; crowd. 

  • A narrow passage. 

thring

verb
  • To thrust; crowd; press; squeeze. 

  • To push; to force one's way. 

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