lurk Definition

lurk
verb lurked, lurking

1. To lie in wait, especially in ambush, with some sinister purpose in mind.

Thesaurus: prowl, sneak, crouch, skulk, slink, hide.
2. To linger unseen or furtively; to be latent.

Example: The idea lurked at the back of his mind

Idiom: a lurking suspicion

A feeling, especially one which is difficult to justify, that something is wrong.

Etymology: 14c.