Present participle of 'girt,' meaning the action of encircling, securing with a girth or belt, or mentally preparing oneself.
From Old English 'gyrdan' plus '-ing' suffix. Shows how English creates continuous action words through the gerund form.
In medieval literature, 'girting your loins' was the precise physical equivalent of what we now call 'getting ready for action'—it meant literally pulling your clothing tight so you could move faster. The metaphor worked because everyone understood the physical action.
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