UNDERGIRD

Passing a cable several times under and around a ship and tightening it on deck, to prevent the working and parting of the timbers and planks in a gale, Ac 27:17. The process is called frapping, and has been resorted to in various instances in modern times.

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undergird. Undergird, v.t. undergirded, undergirt, pret. and part. to bind or fasten the bottom

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Un′der‐gird″ (?), v. t. To bind below; to gird round the bottom. They used helps, undergirding the ship. Acts xxvii. 17.