v. phr. To be one of the first members or employees to participate in the growth of a firm, educational institution, etc. Elliott got in on the ground floor and made a fortune at the company. Mr. Smith who joined the new college as an instructor, got in on the ground floor, and wound up as its president after twenty years.
GET IN ON THE GROUND FLOOR
Meaning of GET IN ON THE GROUND FLOOR in English
American idioms English vocabulary. Английский словарь американских идиом. 2012