Undergird (ὑποζώννυμι, lit. to gird under the breast, 2 Macc. 3, 19; comp. 2Elian, V. H. 10:22), a naval term employed (Ac 27:17) to designate the act of passing cables around the middle of a ship in order to strengthen it (so Polybius, 27:3, 3; Appian, Bell. 104. 5, 91; Plato, Rep. p. 616). SEE SHIP.