grow, progress, unfold, or evolve gradually through a process of evolution, natural growth, or differentiation; "A flower developed on the branch"; "The country developed into a mighty superpower"
2
appear
come into sight or view; "He suddenly appeared at the wedding"; "A new star appeared on the horizon"
2
expand
become larger in size or volume or quantity; "his business expanded rapidly"; "The bag will expand when pressure is lowered"
