imply vs stand for

imply

verb
  • to have as a necessary consequence 

  • to suggest by logical inference 

  • to hint; to insinuate; to suggest tacitly and avoid a direct statement 

stand for

verb
  • To tolerate 

  • To mean; to symbolize; to represent 

  • To advocate, to support 

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