Lewis Short
(adverb) : istuc, isto- (iste) ce
* Thither, esp. in reference to the place where the party addressed is: concedite istuc,Plaut. As. 3, 3, 56: istuc eo quantum potest,id. Merc. 4, 1, 25: jam istuc ego revortar,id. Poen. 3, 3, 1; Ter. Eun. 4, 4, 39: dabam operam, ut istuc veniam ante quam plane ex animo tuo effluo,Cic. Fam. 7, 14, 1: istuc mens animusque Fert,Hor. Ep. 1, 14, 8: dum transferor istuc,Ov. H. 18, 205.
* Transf., to that thing, to that subject in discourse, etc.: hoc quod coepi primum enarrem: Post istuc veniam,Ter. Heaut. 2, 3, 33: scio: istuc ibam,id. Ad. 5, 3, 35.
Charlton T. Lewis, Charles Short, A Latin Dictionary