"Gird on" is an idiom that means to prepare oneself for a task or activity, typically by mentally or physically equipping oneself. Synonyms for this phrase include "gear up," "get ready," "brace oneself," "prepare oneself," "set oneself up," and "steel oneself." These synonyms emphasize the idea of getting oneself mentally and physically ready for a challenge or a task ahead. However, "gird on" also has a historical usage, indicating the act of putting on a belt or a sword. Therefore, "buckle on," "strap on" and "arm oneself" can also be considered as synonyms for "gird on," expressing the more literal meaning of the phrase.