lurking

/L ER1 K IH0 NG/
verb
  1. 1

    To remain concealed in order to ambush.

  2. 2

    To remain unobserved.

  3. 3

    To hang out or wait around a location, preferably without drawing attention to oneself.

  4. 4

    To view an internet forum without posting comments.

  5. 5

    To saddle (a person) with an undesirable task or duty.

noun
  1. 1

    The act of one who lurks.

Source: https://en.wiktionary.org/wiki/lurk, https://en.wiktionary.org/wiki/lurking