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Old 15th May 2019, 8:36 pm   #7
Dave Moll
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Join Date: Feb 2005
Location: West Cumbria (CA13), UK
Posts: 4,101
Default Re: Line Tester - my ignorance is boundless!

I don't know how true this is, but I have heard that "butt" derives from the linesman's ability to butt into a telephone conversation. I've also known the 'phone to be called a buttinski, which would tie in with that derivation.
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