covert - a. 隐蔽的,偷偷摸摸的,隐密的; n. 藉口,树丛,蔽覆羽翮基部的羽毛;

• The fox went into the covert.
• The army should keep track of covert actions by the forign espionage agencies.
• Thus an individual with a covert bacteriuria has a life expectancy of less than 3 years.