the sky's the limit (informal)
There are no restrictions on amount or extent (of something)
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Main Entry: ↑sky
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informal there is practically no limit (to something such as a price that can be charged or the opportunities afforded to someone)
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the sky's the limit
— used to say that there are no limits and that anything is possible
You can achieve anything if you really want to. The sky's the limit.
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Main Entry: ↑limit
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Main Entry: ↑sky
Useful english dictionary. 2012.