Use 'tocsin' when danger is immediate and action must be taken quickly. A tocsin sounded throughout the town, signaling the approaching storm.
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Historic Reference
'Tocsin' often refers to historical or communal alerts, not modern personal alarms. The watchman rang the tocsin as the enemies breached the castle walls.
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Not Just Bells
While traditionally a bell, 'tocsin' can refer to any alarm sound or system. The factory's tocsin blared, signaling everyone to evacuate.