act vs cross the line

act

verb
  • To do something. 

  • Of a play: to be acted out (well or badly). 

  • To perform a theatrical role. 

  • To play (a role). 

  • To convey an appearance of being. 

  • To map via a homomorphism to a group of automorphisms (of). 

  • To feign. 

  • To have an effect (on). 

  • To behave in a certain manner for an indefinite length of time. 

  • To do something that causes a change binding on the doer. 

noun
  • A product of a legislative body, a statute. 

  • A display of behaviour. 

  • A display of behaviour meant to deceive. 

  • A division of a theatrical performance. 

  • Something done once and for all, as distinguished from a work. 

  • Any organized activity. 

  • A performer or performers in a show. 

  • A formal or official record of something done. 

  • The process of doing something. 

  • A thesis maintained in public, in some English universities, by a candidate for a degree, or to show the proficiency of a student. 

  • Something done, a deed. 

cross the line

verb
  • To achieve completion of something. 

  • To finish a race. 

  • To overstep a boundary, rule, or limit; to go too far or do something unacceptable. 

  • To cross the equator, as a vessel at sea. 

  • To film from the opposite side of an imaginary axis on set in order to view the actors from the opposite direction. 

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