late 14c., in reference to disease, "slowly spreading," present-participle adjective from creep (v.). Also from late 14c. in reference to plants, "growing along the surface."
Entries linking to creeping
creep v.
Old English creopan "to move the body near or along the ground as a reptile or insect does" (class II strong verb; past tense creap, past participle cropen), from Proto-Germanic *kreupanan (source also of Old Frisian kriapa, Middle Dutch crupen, Old Norse krjupa "to creep"), perhaps from a PIE root *g(e)r- "crooked" [Watkins].
From c. 1300 as "move secretly or to evade detection," also "move slowly, feebly, or timorously." In reference to imperceptible movements of things (soil, railway rails, etc.) from 1870s. Related: Crept; creeping.