term:

Fraudulent Concealment

fraudulent concealment n

: the intentional failure to disclose a material fact and esp. the existence of a cause of action by one under a duty to make such a disclosure to another who acts or fails to act in reliance and suffers a loss

Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.