Lewis & Short

horsum, adv. [contr. from hoc = huc and vorsum], hitherwards, hither, this way (ante-class.): pergunt, Ter. Hec. 3, 4, 36: horsum se capessit, Plaut. Rud. 1, 2, 83; id. Mil. 2, 3, 33: te adiget horsum insomnia Ter. Eun. 2, 1, 13.