What does 'to gird (up) your loins' mean.
It literally means to get ready for a difficult or dangerous situation.
'Gird up your loins' refers to mentally preparing yourself for hardships ahead.
This idiomatic expression has biblical roots and refers to the soldier in battle literally pulling up the hem of his long garment so that it would not impede him in running to and fighting in battle.
Joe's girding up his loins to prepare for a high level meeting with two of his leading stakeholders.
It can be used both literary and humorously.
Prime minister May is girding herself up for yet another confrontation with the Labour party at the House of Commons.
We can also leave out 'your loins'. The meaning is still the same.
You'd better gird yourself Susie's doing the cooking this weekend!