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Britishism for a public-address or loudspeaker system, a use of a corporate name as generic, like the American "Coke machine" or "Kleenex". Derived from TANtalum allOY, the Tannoy company builds loudspeakers and high-end audio speakers and is still in business.
"Where are you going, Mac?"

"Didn't you hear? They came over the tannoy five minutes ago and said we'd be closing early on account of Christmas Eve."
by al-in-chgo December 19, 2014
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