Wiktionary
alarm-bell
n. 1 (context historical English) A bell rung to signal danger or emergency. 2 A bell which is rung to indicate a pre-arranged time, especially to mark a desired moment for waking up, performing a specific action etc.
Usage examples of "alarm-bell".
Even the great alarm-bell on the roof must have felt the force of the wind, for the rope rose and fell slightly, as though the bell were moved a little from time to time, and the limber rope fell on the oak floor with a hard and hollow sound.