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English definition of “lurk”

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lurk

verb uk   /lɜːk/ us    /lɝːk/
[I usually + adv/prep] to wait or move in a secret way so that you cannot be seen, especially because you are about to attack someone or do something wrong: Someone was lurking in the shadows. Why are you lurking around in the hallway? [I usually + adv/prep] (of an unpleasant feeling or quality) to exist although it is not always noticeable: Danger lurks around every corner. It seems that old prejudices are still lurking beneath the surface. [I] informal internet & telecoms to spend time in a chat room or on a social media website and read what other people have posted (= written or added) without posting anything yourself
lurking
adjective uk   /ˈlɜː.kɪŋ/ us    /ˈlɝː-/
I have some lurking doubts (= doubts which will not go completely away) about whether Simon is really capable of doing this job. She said she had a lurking suspicion (= she had a very slight feeling) that he wasn't telling the truth.
(Definition of lurk from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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