The Collaborative International Dictionary of English v.0.48:
Lurk \Lurk\ (l[^u]rk), v. i. [imp. & p. p. Lurked (l[^u]rkt);
p. pr. & vb. n. Lurking.] [OE. lurken, lorken, prob. a dim.
from the source of E. lower to frown. See Lower, and cf.
Lurch, a sudden roll, Lurch to lurk.]
1. To lie hidden; to lie in wait.
Like wild beasts, lurking in loathsome den.
Let us . . . lurk privily for the innocent. --Prov.
2. To keep out of sight.
The defendant lurks and wanders about in Berks.
Moby Thesaurus II by Grady Ward, 1.0:
81 Moby Thesaurus words for "lurking":
abeyant, about to be, already in sight, approaching, at hand,
between the lines, brewing, close, close at hand, coming, covert,
cryptic, delitescent, doggo, dormant, esoteric, forthcoming,
furtive, future, gathering, going to happen, hibernating, hidden,
hidden out, immediate, imminent, impendent, impending, in ambush,
in danger imminent, in hiding, in prospect, in reserve, in store,
in the cards, in the offing, in the wind, in the wings, in view,
instant, latent, looming, lowering, menacing, muffled, mystic,
near, near at hand, nearing, obfuscated, obscured, occult,
on the horizon, on tiptoe, overhanging, possible, potential,
preparing, prowling, pussyfoot, pussyfooted, quiescent, skulking,
sleeping, sneaking, stealing, stealthy, submerged, surreptitious,
that will be, threatening, to come, under cover, under the surface,
underlying, unmanifested, upcoming, veiled, virtual, waiting,
The Free On-line Dictionary of Computing (30 December 2018):
The activity of one of the "silent
majority" in a electronic forum such as Usenet; posting
occasionally or not at all but reading the group's postings
regularly. This term is not pejorative and indeed is casually
used reflexively: "Oh, I'm just lurking". Often used in "the
lurkers", the hypothetical audience for the group's
Lurking and reading the FAQ are recommended netiquette for
beginners who need to learn the history and practises of the
group before posting.