Abbott-Smith Manual Greek Lexicon
ὑπο-ζώννυμι (G5269)
1 ** ὑπο-ζώννυμι [in LXX: II Mac 3:19 * ;] to undergird (Hdt., al.; ὑπὸ τ. μάστους , II Mac, l.c. ); of a ship, to undergird or frap : Ac 27:17 (v. DB , ext. 367 a ).†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain