Ausim is really an optative, a single form that remained in Latin. The optative, a mood to express wishes mainly, is very frequent in Greek. <br />In Latin, the subjunctive took the function of the old optative. <br />So we can say that in classical Latin ausim = audeam. <br />The optative is also used sometimes to ecpress something in a very polite way. Ausim can aslo be used so. In Roman ears of the classical period it must have sound very chic.