Meaning

verb prepare oneself for a military confrontation

verb put a girdle on or around

verb bind with something round or circular

originFrom Middle English girden, gerden, gürden, from Old English gyrdan (“to put a belt around, to put a girdle around”), from Proto-Germanic *gurdijaną (“to gird”), from Proto-Indo-European *gʰerdʰ-. Cognate with West Frisian gurdzje, girdzje, Dutch gorden, German gürten, Swedish gjorda, Icelandic gyrða, Albanian ngërthej (“to tie together by weaving, to bind”).

Etymology from Wiktionary, CC BY-SA 3.0