Is it ensure, insure, or assure?
late 14c., from Old French total, from Medieval Latin totalis "entire, total" (as in summa totalis "sum total"), from Latin totus "all, whole, entire," of unknown origin. Total war is attested from 1937, in reference to a concept developed in Germany.
1550s, from total (adj.).
1716, from total (n.). Meaning "to destroy one's car" first recorded 1954. Related: Totaled; totaling.
An even matter; a case of even probabilities, values, etc: It's a toss-up between those two candidates/ I don't know which way to bet; it's a toss-up
[1809+; fr the fact that the choice might as well be made by tossing up a coin]