1. to begin to have success with something that you want to do.

They won't even get to first base with the directors with a proposal like that.

2. to get to the first stage of a sexual relationship, where partners kiss and touch each other.

Jimmy hasn't even gotten to first base yet with his girlfriend.

• put shirt on something
• put shoulder to the wheel
• put someone at odds with
• put someone at odds with someone
• put someone back on track
• put someone in a hole
• put someone in mind of
• put someone in mind of someone
• put someone in mind of something
• put someone in place
• put someone in their place
• put someone in the picture
• put someone in the shade
• put someone off stride
• put someone off their stride
• put someone off the scent
• put someone on a collision course
• put someone on a pedestal
• put someone on edge
• put someone on the map
• put someone on the right track
• put someone on the shelf
• put someone on the spot
• put someone out of action
• put someone out of its misery