noun
a main line or route, especially of a railroad or bus system
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The trunk line is the main artery of the telecommunications network, carrying all the data and voice traffic.
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Make sure you don't accidentally cut the trunk line when doing any digging in the backyard.
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I heard the trunk line got upgraded to fiber optic, so our internet should be super fast now.
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In the family tree, the grandfather is considered the trunk line that connects all the branches together.