outstrip vs top it off

outstrip

verb
  • To exceed or surpass (someone or something). 

  • To move more quickly than (someone or something) so as to outrun or leave it behind. 

top it off

verb
  • To emphasize or underscore; to make something even better or worse. 

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