Correct spelling for the English word "sisted" is [sˈɪstɪd], [sˈɪstɪd], [s_ˈɪ_s_t_ɪ_d] (IPA phonetic alphabet).
To sist procedure, to delay judicial proceedings in a cause; to sist one's self, to take a place at the bar of a court where one's cause is to be tried.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.