Which is why I'd best keep him well away from you.
On the other hand, perhaps this was a matter best kept between the two of them for now.
Communications with the press, in my experience, are best kept short and simple.
I explained how they could best keep out of trouble.
Of course they keep best, but it seems such a waste.
"I think we'd best keep this between the two of us."
Some things are best kept from the eyes of the world.
"An' unless you want trouble around here you'd best not keep me waiting."
Such things were best kept beyond the reach of mortal knowledge.
But she was sad enough already, and these thoughts were best kept to himself.