Is it ensure, insure, or assure?
also sneap, "to be hard upon, rebuke, revile, snub," early 14c., from Old Norse sneypa "to outrage, dishonor, disgrace," probably related to similar-sounding words meaning "cut" (cf. snip (v.)). Verbal meaning "bevel the end (of a timber) to fit an inclined surface" is of uncertain origin or connection. Snaiping "rebuking, reproaching, reviling" is attested from early 14c.