What is "lurkers"

Usage examples of "lurkers".

From the lurkers, van Liesvelt steps forward, a big shambling bear-shape that carries his familiar grin.

It was pretty much the same setup that she had remembered from her first visit to The Willows, and, at least at first glance, she was certain she carried the right programs to deflect any lurkers in the system.

She lets him go, and the lurkers move warily away, giving him a wide berth.

Arthur turned sharply again after he strode into the chamber, held up the curtain and gave a quick look right and left as if he would make sure there were no lurkers outside.