cross the line vs go too far

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

To achieve completion of something. 

To finish a race. 

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. 

To exceed an unstated limit, especially a limit of acceptable behaviour.