single crownn.Nautical a single crowning given to a knot (see crownv.1 14, crowningn. 6).
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1808 D. LeverYoung Sea Officer's Sheet Anchor 5 To Double Wall this Knot... The knot will appear..having a double wall, and single crown.
1883 Man. Seamanship for Boys' Training Ships Royal Navy (1886) 121 Form a double-wall, single-crowned, then lay the strands by the sides of those in the single-crown.