1) to undergird
1a) to bind a ship together laterally: i.e. with girths or cables, to enable it to survive the force of waves and tempest
Part of Speech: verb
From G5259 and G2224; to gird under, that is, frap (a vessel with cables across the keel, sides and deck): - undergirt.
|brace a ship||54.25|
These two sites give similar information, with the definition from several dictionaries and statistics on the use of the word.
Perseus Digital Library
University of Chicago's Logion lexicon
Thayer's dictionary plus other information.
From this site's dictionary (in Italian)
Click on the first column to search for that word as a form of the root ὑποζώννυμι; click on the second column to search for that grammatical form of the root ὑποζώννυμι; click on the third column to search for that word and grammatical form; click on the total to search for the root ὑποζώννυμι.