Etymology
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tocsin (n.)

"alarm bell," 1580s, from French toquassen "an alarm bell, the ringing of an alarm bell" (late 14c.), from Old Provençal tocasenh, from tocar "to strike" (from Vulgar Latin *toccare "strike a bell;" see touch (v.)) + senh "bell, bell note," from Late Latin signum "bell, ringing of a bell," in Latin "identifying mark, sign" (see sign (n.)). The current English spelling is from 1794, adopted from modern French.

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Definitions of tocsin

tocsin (n.)
the sound of an alarm (usually a bell);
Synonyms: alarm bell
tocsin (n.)
a bell used to sound an alarm;
Synonyms: warning bell
From wordnet.princeton.edu