Meaning of “be/get in on the ground floor” in the English Dictionary

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"be/get in on the ground floor" in British English

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be/get in on the ground floor

to be or become involved in something from the beginning:

He was sure that he was getting in on the ground floor with the next big thing.
Can someone tell me how you get in on the ground floor of a deal like that?

(Definition of “be/get in on the ground floor” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)