Grande sonnerie (French, meaning 'grand strike') is a complication in a mechanical watch or clock which combines a quarter striking mechanism with a repeater. On the quarter-hour, it strikes the number of hours audibly on a gong, and then the number of quarter-hours since the hour on a second gong. In addition it can strike the hours on demand, at the push of a button.[1][2] The term is sometimes used erroneously for a mere quarter striking mechanism.[3]
It is more complex than the petite sonnerie, which merely strikes the hours on the hour and the quarter hours on the quarter, with no repeater function.[4]