Lewis & Short

occulco (obc-), āvi, ātum, 1, v. a. [obcalco]. to tread or trample down (mostly ante-class.): bene occulcato, Cato, R. R. 49, 2: (cohors) occulcata pedibus, Varr. R. R. 1, 13, 4; Liv. 27, 14, 7 Drak. N. cr.