go by the wayside vs obsolete

go by the wayside

verb

  • To become obsolete or outmoded. 

obsolete

verb

  • To cause to become obsolete. 

adj

  • No longer in use; gone into disuse; disused or neglected (often in favour of something newer). 

  • Imperfectly developed; not very distinct. 

How often have the words go by the wayside and obsolete occurred in a corpus of books? (source: Google Ngram Viewer )