Learner's definition of LURK
to be in a hidden place
to wait in a secret or hidden place especially in order to do something wrong or harmful
— often used figuratively
Trouble lurks around every corner.
There is tenderness that lurks underneath his tough appearance.
Who knows what evil lurks in the hearts of men?
The idea had been lurking in her mind for some time.
to read messages written by other people on the Internet in a newsgroup, chat room, etc., without writing any messages yourself