in on the ground floor
US /ɪn ɑn ðə ɡraʊnd flɔr/
UK /ɪn ɑn ðə ɡraʊnd flɔr/

1.
从一开始就参与, 在萌芽阶段
involved in something from the very beginning, especially a business venture, to gain an advantage
:
•
He got in on the ground floor with the new tech startup and made a fortune.
他从新的科技初创公司一开始就参与,发了大财。
•
If you want to succeed, you need to get in on the ground floor of emerging industries.
如果你想成功,你需要从一开始就参与新兴产业。