ἀναζώννυμι: to gird up; middle to gird up oneself or for oneself: ἀναζωσάμενοιτάςὀσφύας, 1 Peter 1:13, i. e. prepared — a metaphor derived from the practice of the Orientals, who in order to be unimpeded in their movements were accustomed, when about to start on a journey or engage in any work, to bind their long and flowing garments closely around their bodies and fasten them with a leathern girdle; cf. περιζώννυμι. (the Sept. Judges 18:16; Proverbs 29:35 (); Dio Chrysostom or. 72, 2, edition, Emp., p. 729; Didymus, quoted in Athen. 4 (17), p. 139 d., others.)
1 Peter 1:13 - V-APM-NMP GRK:Διὸ ἀναζωσάμενοι τὰς ὀσφύας NAS: Therefore, prepare your minds KJV: Wherefore gird up the loins of your INT: Therefore having girded up the waist
