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Cerberus

Ancient Greek and Roman mythology

Phraseologism: Cerberus.

Meaning: A ferocious, vigilant guardian.

Origin: From ancient Greek mythology. Cerberus - a three-headed dog sitting at the entrance to the kingdom of Hades - the underground abode of the dead. When one head sleeps, the others are awake. He lets everyone freely into Hades, but does not let anyone out.

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