Is it ensure, insure, or assure?
"complete, total," Old English utera, uterra, "outer," comparative adjective formed from ut (see out), from Proto-Germanic *utizon (cf. Old Norse utar, Old Frisian uttra, Middle Dutch utere, Dutch uiter-, Old High German uzar, German äußer "outer").
"speak, say," c.1400, in part from Middle Low German utern "to turn out, show, speak," from uter "outer," comparative adj. formed from ut "out;" in part from Middle English verb outen "to disclose," from Old English utan "to put out," from ut (see out). Cf. German äussern "to utter, express," from aus "out;" and colloquial phrase out with it "speak up!" Formerly also used as a commercial verb (as release is now). Related: Uttered; uttering.