suck in vs warn

suck in

verb
  • To cause (someone) to become slowly more and more involved in some business or situation that may not be to their advantage. 

  • To draw inward. 

warn

verb
  • To notify or inform (someone, about something). 

  • To caution or admonish (someone) against unwise or unacceptable behaviour. 

  • To give warning. 

  • To summon (someone) to or inform of a formal meeting or duty. 

  • To advise or order to go or stay away. 

  • To make (someone) aware of impending danger, evil, etc. 

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