compare notes

compare notes (on sth) AND swap notes (on sth) (exchange information and opinions) — обмениваться впечатлениями, наблюдениями, сведениями, мнениями

Example 1: We met at the coffee shop to compare notes on our new boss.

Example 2: The two sisters always swapped notes on guys they were dating.

Example 3: We'd both been out with the same man at different points in our lives so it was interesting to compare notes.(CALD)