creep

move slowly; in the case of people or animals with the body near the ground

The crocodile was crawling along the riverbed

to go stealthily or furtively

..stead of sneaking around spying on the neighbor's house

grow or spread, often in such a way as to cover (a surface)

ivy crept over the walls of the university buildings

someone unpleasantly strange or eccentric

a slow longitudinal movement or deformation