A rope or line used to support or secure a cantle (saddle back) or cargo; a shipping or maritime term.
From cant (angled edge or support) plus line, or possibly a nautical term from Dutch kant (edge). The exact origin is uncertain but appears in maritime contexts.
Cantline is a ghost word from maritime history—it appears in 19th-century shipping logs and cargo inventories but has largely disappeared as sailors abandoned these specific terminology traditions.
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