sweet talk 
informal
verb (sweet-talk) [with object]
Insincerely praise (someone) in order to persuade them to do something: detectives sweet-talked them into confessing...
- After sweet-talking Ruth and charming his way into the Lewis household, it's soon clear that Moz's eye for the ladies extends as far as Steve's blossoming 15 year-old daughter Hannah.
- The men degrade the women for being a ‘welfare mother,’ she says, and then ‘the next thing you know, two days before check day, they're sweet-talking her.’
- This led to me doing a brief stint at a telemarketing centre sweet-talking old ladies into spending their pension checks on tickets to the Garden Brothers Circus.
noun [mass noun]
Insincere praise used to persuade someone to do something: she thought I was just giving her meaningless sweet talk...
- When you ask Mr. Haddad to confirm it in writing, he will start talking sweet talk and nice words such as: ‘I am a respectable man.
- What sort of sweet talk is possibly needed to persuade a 14-year-old to enter the room of a complete stranger and, presumably, a foreigner?
- From this moment we won't be appeased by fork-tongued, sweet talk.