When you hang around outside someone's home hiding in the bushes, this is an example of lurk.
When you read an online forum discussion without registering or contributing, this is an example of lurk.
Thieves lurking in the shadows.
Heard him lurking along the corridor.
Danger lurking around every bend.
Origin of lurk
- Middle English lurken possibly of Scandinavian origin
From American Heritage Dictionary of the English Language, 5th Edition