Nautical A rope attached to the weather leech of a square sail to hold the leech forward when sailing close-hauled.
A knot forming a loop that does not slip.
[Middle English bouline, probably from Middle Danish bovline or Middle Low German bōlīne, both from Middle Low German bōch līne : bōch, bow; see bheug- in Indo-European roots + līne, line (from Latin līnea; see line1).]
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