[ὑποζώννυμι] from G5259 and G2224; to gird under, i.e. frap (a vessel with cables across the keel, sides and deck)
Usages throughout the bible
Acts 27:17
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Which when they had taken up, they used helps, undergirding G5269 the ship; and, fearing lest they should fall into the quicksands, strake sail, and so were driven.