Things going well with the wife meant only one on the side?

That's what the words seemed to mean on their face value.

She knew he meant on a personal level rather than a professional one.

I mean, on the surface it looks like a good thing.

It is also used to mean all the people on one level of a family tree.

Do you mean a bell on the outside of the house?

"I mean earlier tonight, on the hill down toward the river?"

In business, it would mean a high return on investment.

They should be red in the middle, which means about two minutes of cooking on each side.