British slang for television, what Americans would call 'TV.'
Short for 'television,' with the '-y' suffix making it informal and friendly, similar to how 'movie' comes from 'moving picture.' Became standard British English in the 1950s.
Brits say 'telly,' Americans say 'TV,' and Australians say 'the box'—the same invention got totally different nicknames depending on where you lived, which shows how language evolves differently in each country.
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