CHANGE [I, T] › to grow or change and become more advanced, or to make someone or something do this: The baby develops inside the mother for nine months. She's taking a course to develop her computer skills. He's developing into a very good tennis player. MAKE [T] › to make something new such as a product: Scientists are developing new drugs all the time. ILLNESS [T] › to start to have something, such as an illness, problem, or feeling: Shortly after take-off the plane developed engine trouble. He's recently developed an interest in football. HAPPEN [I] › to start to happen or exist: Further problems may develop if you do not deal with this now. FILM [T] › to use special chemicals on a piece of film to make photographs appear: I need to get my holiday photos developed. BUILD [T] › to build houses, factories, shops, etc on a piece of land