verb

grow or cause to grow and become more mature, advanced, or elaborate.

motion pictures were to develop into mass entertainment

grow,evolve,mature,expand,enlarge,spread,advance,progress,prosper,succeed,thrive,get on well,flourish,blossom,bloom,burgeon,make headway,be successful,go great guns,initiate,instigate,set in motion,put in place,institute,inaugurate,originate,invent,form,establish,fashion,generate,undertake,embark on