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

1.
no início, desde o começo
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.
Ele entrou no início da nova startup de tecnologia e fez uma fortuna.
•
If you want to succeed, you need to get in on the ground floor of emerging industries.
Se você quer ter sucesso, precisa entrar no início das indústrias emergentes.