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
Sorry, no etymologies found.
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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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