suspect vs watch for

suspect

adj
  • Viewed with suspicion; suspected. 

  • Viewing with suspicion; suspecting. 

noun
  • A person who is suspected of something, in particular of committing a crime. 

verb
  • To have suspicion. 

  • To imagine or suppose (something) to be true, or to exist, without proof. 

  • To believe (someone) to be guilty. 

  • To distrust or have doubts about (something or someone). 

watch for

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