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Definition of Strongback
1. Noun. (nautical) The fore-and-aft spar extending from stem to stern on a lifeboat and serving as a raised spreader for a boat cover. (FM 55-501). ¹
2. Noun. (nautical) A strong bar placed across a hatch opening to hold hatch boards or hatch covers. (FM 55-501). ¹
¹ Source: wiktionary.com