Lewis Short
(verb) : occulco (obc-), āvi, ātum, 1, 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.
Charlton T. Lewis, Charles Short, A Latin Dictionary