S: (n) bell, toll (the sound of a bell being struck) "saved by the bell"; "she heard the distant toll of church bells"
S: (n) bell, ship's bell ((nautical) each of the eight half-hour units of nautical time signaled by strokes of a ship's bell; eight bells signals 4:00, 8:00, or 12:00 o'clock, either a.m. or p.m.)