To meet is to part.

It was a mistake on their part.

It seems that the rich part of humanity doesn't care much for the problems of the poor part.

They parted with a firm handshake.

There was no objection on his part.

There was no mistake on his part.

There was no irritation on his part.

Extinction is part of evolution.

Man is part of nature.

I'm a stranger in these parts.