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expand (one's) horizons
To have or seek out new experiences, especially if one's experiences have been relatively limited. I'm really nervous to live at school, but I know I need to expand my horizons and get some experience living without my family. I can't believe that Molly has never left the state before! She seriously needs to expand her horizons!
expand (something) into (something)
1. To become larger or more extensive. Don't pull the cord on that, or it will expand into a raft!
2. To make something larger or more extensive. In this usage, a noun or pronoun is used between "expand" and "into." Don't expand that into a raft just yet—wait till we get to the lake. The publisher wants me to expand my short story into a novella.
expand (up)on (something)
To discuss a topic in more detail. This is such an important point that I'd like you to expand upon it when you revise your paper.
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 somethingand enlarge (up)on something
Fig. 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?