pass between somebody

He didn't care at all for whatever had passed between them.

Much still needs to be learned about how the disease is passed between men and women.

He told her what had passed between him and his mother since she left them.

Some kind of understanding passed between them based on a look he gave her.

Someone or something had passed between him and the light!

She would be changed a little by what had passed between them.

As we went a few words had passed between us.

Something more had passed between the women while she was gone.

She told him what had passed between them in the last hour of the old life.

Knowledge of some kind had passed between them, but what?