Undergirding
From BiblePortal Wikipedia
Morrish Bible Dictionary [1]
The binding of either ropes or chains round a ship in bad weather, to keep it from parting asunder in consequence of its being old or because of its imperfect construction. Acts 27:17 . It is called in the navy frapping.
Smith's Bible Dictionary [2]
Undergirding. Acts 27:17. See Ship .
Hastings' Dictionary of the Bible [3]
Undergirding . See Helps; Ships, etc., p. 850 b .
Hastings' Dictionary of the New Testament [4]
See Ship.
International Standard Bible Encyclopedia [5]
un - dẽr - gûrd´ing . See Ships And Boats , III., 2.