horsum, adv. [contr. from hoc = huc and vorsum],
hitherwards , hither , this way (ante-class.): pergunt, Ter. Hec. 450: horsum se capessit, Plaut. Rud. 1, 2, 83; id. Mil. 2, 3, 33: te adiget horsum insomnia Ter. Eun. 219.
hōrsum adv. ho- (for hoc, huc)+vorsum, hitherwards, hither, this way : pergere, T. ...
An Elementary Latin Dictionary