get to first base
US /ɡɛt tə fɜrst beɪs/
UK /ɡɛt tə fɜrst beɪs/

1.
to make a successful start in an activity or relationship, but not necessarily complete it
:
•
We couldn't even get to first base with our proposal; the committee rejected it immediately.
•
After weeks of trying, he finally managed to get to first base with his new business idea, securing a small investment.
2.
to engage in the first level of sexual intimacy, typically kissing or touching
:
•
They've been on a few dates, but haven't even gotten to first base yet.
•
He was hoping to get to first base on their date, but she wasn't ready.