sweet-talk vs try to win over

sweet-talk

noun
  • A manner of talking to someone in a pleasing or funny way in order to persuade them to do or believe something. 

verb
  • To persuade using flattery. 

  • To flatter. 

try to win over

How often have the words sweet-talk and try to win over occurred in a corpus of books? (source: Google Ngram Viewer )