Is it ensure, insure, or assure?
1560s, "to stand in front of," from Middle French confronter (15c.), from Medieval Latin confrontare "assign limits, adjoin," from Latin com- "together" (see com-) + frontem (nominative frons) "forehead" (see front (n.)). Sense of "to face in defiance or hostility" is late 16c. Related: Confronted; confronting.