Is it ensure, insure, or assure?
"to expose to the action of fire," 1580s, perhaps from French braser "to solder," in Old French, "to burn," related to brese "embers" (see braise). Related: Brazed; brazing.
"to make of or cover in brass," Old English brasian "to do work in brass, make of brass," from bræs (see brass). Cf. glaze from glass.