lurk   verb [I usually + adv/prep]
 to wait or move in a secret way so that you cannot be seen, esp. because you are
 about to attack someone or do something wrong
 As I walked down the dark street, I thought I saw someone lurking in the shadows.
 Why are you lurking about in the corridor?
 They wondered what else lurked behind his official statement. [I usually + adv/prep]
 It seems that old prejudices are still lurking beneath the surface.
 FIGURATIVE The memory of the Wall Street crash still lurks in (=has not completely gone
 away from) the minds of bankers. [I usually + adv/prep]
 FIGURATIVE There is danger lurking (=existing where it cannot be seen) around every
 corner. [I usually + adv/prep]

 lurking   adjective [not gradable]
 As the light improved the boys discovered that the lurking giants were nothing but a
 field of tree stumps.
 The device is used to help spot lurking submarines.
 FIGURATIVE I have some lurking doubts (=doubts which will not go completely away)
 about whether Simon is really capable of doing this job.
 FIGURATIVE She said she had a lurking suspicion (=she had a very slight feeling) that he
 wasn't telling the truth.