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• n  the sound of an alarm (usually a bell)
• n  a bell used to sound an alarm

• The world might better have been stunned as by a tocsin of calamity.
• Education's myriad Wirts were ready for anything up to and including a Communist tocsin when the American Historical Association's Social Studies Commission finally announced its.
• No defeatist, in The Hour of Decision he rings a tocsin.

• alarm bell
• warning bell