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The Collaborative International Dictionary
Bed screw

Bed screw \Bed" screw`\

  1. (Naut.) A form of jack screw for lifting large bodies, and assisting in launching.

  2. A long screw formerly used to fasten a bedpost to one of the adjacent side pieces.

Wiktionary
bed screw

n. 1 (context nautical English) A form of jack screw for lifting large bodies and assisting in launching. 2 A long screw formerly used to fasten a bedpost to one of the adjacent side pieces.