Is it ensure, insure, or assure?
late 13c., "state of impaired reputation, disgrace or dishonor;" c.1300, "a false tale; the fabrication and dissemination of false tales," from Anglo-French esclaundre, Old French esclandre "scandalous statement," alteration ("with interloping l" [Century Dictionary]) of escandle, escandre "scandal," from Latin scandalum "cause of offense, stumbling block, temptation" (see scandal). From late 14c. as "bad situation, evil action; a person causing such a state of affairs."
c.1300, from Anglo-French esclaundrer, Old French esclandrer, from esclandre (see slander (n.)). Related: Slandered; slandering; slanderer.