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double wall

double wall
  In full double wall knot: see wall-knot. Hence double-wall v.

1801 J. J. Moore Brit. Mariner's Vocab. sig. M1v, Double wall Knot. 1808 D. Lever Yng. Sea Officer's Sheet Anchor 5 To Double Wall this Knot... The knot will appear..having a double wall, and single crown. 1841 R. H. Dana Seaman's Man. vii. 37 Make the single wall slack, and crown it... Thus made, it has a double wall. Ibid. 38 It may be double walled by next passing the strands under the walling on the left of them.

Oxford English Dictionary

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