From English - German Ding/FreeDict dictionary ver. 1.9-fd1:
assure /əʃˈʊə/ <v>
etw. gewährleisten, sicherstellen, sichern, für etw. sorgen <v>
"assure sb.'s safety" - jds. Sicherheit gewährleisten
Synonyms: ensure, insure, guarantee sth.
see: ensuring, insuring, assuring, guaranteing, ensured, insured, assured, guaranteed, ensures, insures, assures, guarantees, ensured, insured, assured, guaranteed, This is the only way to guarantee that …