gird up one's loins

Meanings:

• 1.

  HistoricalBiblical/older Englishliteralarchaic
  • To draw up and secure garments around the waist or loins to permit freer movement.

• 2.

  UKUSGlobal (English)idiomaticliteraryformal
  • To prepare oneself mentally or physically for a demanding task or challenge; to brace oneself for action.