\ ˈtī-ˌlīn
\
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Definition of tie-line
: a telephone line that directly connects two or more private branch exchanges
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“Tie-line.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/tie-line. Accessed 28 Sep. 2021.
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Time Traveler for tie-line
The first known use of tie-line was in 1923
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