Is it ensure, insure, or assure?
1550s, from Middle French boulette "cannonball, small ball," diminutive of boule "a ball" (13c.), from Latin bulla "round thing, knob" (see bull (n.2)). Earliest version of bite the bullet recorded 1891, probably with a sense of giving someone a soft lead bullet to clench in the teeth during a painful operation.
: currently bulleting up the chartsRelated Terms
an elongated metal projectile that is fired by a pistol, rifle, or machine gun. Bullets are measured by their calibre, which indicates the interior diameter, or bore, of a gun barrel. (See bore.