a rope dragging from something; dragrope.

1915–20, Americanism; drag + line1

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World English Dictionary
dragline (ˈdræɡˌlaɪn)
1.  another word for dragrope
2.  dragline crane, Also called: dragline excavator a power shovel that operates by being dragged by cables at the end of an arm or jib: used for quarrying, opencast mining, etc

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Example sentences
Dragline silk combines toughness and strength to an extraordinary degree.
Most of the research has focused on a type of silk known as dragline, which
  spiders use to construct the frame of their web.
The dragline moves by utilizing the walking shoes attached to the machine on an
  eccentric arm rotated by a geared mechanism.
The keyway, or ditch, is an area excavated by the dragline along the seam coal
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