If anyone did know her secret, that person certainly concealed the fact well.

"I take it you did not conceal the fact from him."

And no effort was made to conceal the fact that death occurred in the woman's apartment.

There would be no use in trying to conceal the fact that the crime ring is moving.

Did you conceal the fact that she was there to shield her?

The Czech players make no attempt to conceal the fact.

His hands were shaking and he made no attempt to conceal the fact.

"To conceal the fact that it could be done, the birth was made to appear natural."

It had been lived in not long since, and only a clumsy effort made to conceal the fact.

And there was no reason to conceal from Sam the fact that they were lovers.