expand into something
to grow into something; to enlarge into something. The little problem expanded into a big one in no time at all. In no time at all, the vegetable garden had expanded into a small farm.
expand one's horizons
Fig. to experience and learn new things. Read more! Travel! Go out and expand your horizons!
expand something into something
to enlarge something into something; to make something grow into something. She expanded her business into a national company. I would like to build on an addition to expand this room into a more usable space.
expand (up)on something
and enlarge (up)on somethingFig. to add detail to a report about something; to say more about something. Would you please expand upon that last remark? Would you care to enlarge upon your remarks?