The idiom 'Gird up the loin' means 'to be ready'. In earlier times, the Hebrews and the Romans used to wear long loose garments, just like what the Bedouin and the Arabs continue to do today. Therefore, while beginning a heavy and strenuous work people tucked their garments up with a belt so that they can move their limbs freely. From this ancient practice, the phrase 'gird up the loin' has originated which metaphorically means preparing oneself for hard works.
1. We should gird up the loin to fight the poverty and menace of dowry.
2. All players should gird up the loin to face the mighty opponents.
3. He is yet to gird up the loin to take up that responsibility.