Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun UK  A time signal transmitted on radio by theBBC everyhour and consisting of five shortbeeps followed by a longer one, with the longer one coinciding with the start of the hour.
Etymologies
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Examples
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								Thursday - 5th February 1924: The Greenwich Time Signal pips are broadcast on BBC Radio for the first time. Londonist 2009 
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								What will happen to the Greenwich Time Signal when analogue radio is switched off? 
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