gird (v.)

Old English gyrdan "put a belt or girdle around; encircle; bind with flexible material; invest with attributes," from Proto-Germanic *gurdjan (source also of Old Norse gyrða, Old Saxon gurdian, Old Frisian gerda, Dutch gorden, Old High German gurtan, German gürten), from PIE *ghr-dh-, suffixed form of root *gher- (1) "to grasp, enclose." Related: Girded; girding.

Throughout its whole history the English word is chiefly employed in rhetorical language, in many instances with more or less direct allusion to biblical passages. [OED]

As in to gird oneself "tighten the belt and tuck up loose garments to free the body in preparation for a task or journey."

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Definitions of gird from WordNet

gird (v.)
prepare oneself for a military confrontation;
The U.S. is girding for a conflict in the Middle East
Synonyms: arm / build up / fortify
gird (v.)
put a girdle on or around;
gird your loins
Synonyms: girdle
gird (v.)
bind with something round or circular;
Synonyms: encircle