get to first base

1. Reach the initial stage of sexual intimacy, such as kissing. For example, Mary is so shy that I can't even get to first base with her . [1920s]

2. Succeed in the initial phase of something; meet with preliminary approval. For example, They were delighted that they'd gotten to first base in the negotiations . This term alludes to the first base of baseball, which is the first step toward scoring a run for the batter's team. [c. 1900]

Idioms and Phrases

Also, reach first base .