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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Mending is better than Ending (cf Brave New World by Aldous Huxley)
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