They became acquainted with the routine.

He is acquainted with the custom.

In the "Mafia" tradition of organized crime, any member who discloses its operation is sure to be rubbed out.

I am acquainted with the custom.

That's one of the conventions of our daily life.

The coffee break is an American institution.

This is a family tradition.

Why are there twenty nail clippers in this house? Maybe they use a different nail clipper for each finger and toe? Is that the custom in this house?

It's an old Irish tradition.