He says if I don't pay up he'll let on about something that I'm trying to keep dark.
You know something about that Spaniard that you want to keep dark.
No, we've got to keep dark until I can see what's the matter.
Find me five hundred pounds; and I'll show you the receipt and keep dark.
"We shall have to keep dark, however, till the deeds are signed," William said.
"As it is a Shadow Club, we'll keep dark about it," said Kitty.
Will you pledge yourself to keep dark about this talk that we've had?
If you'd been later than five minutes past seven, I was to keep dark.
You may rely on us to back you up, and to keep dark things you would not like to have mentioned.
I came to the conclusion that his desire to keep dark was only a whim, for he is the strangest man that ever walked the earth.