1. gird up one's loins : 准备行动；
1. 耻骨区；私处；（尤指）性器官
Someone's loins are the front part of their body between their waist and legs, especially their sexual parts.
2. （动物的）腰肉，脊背肉
Loin or a loin is a piece of meat which comes from the back or sides of an animal, quite near the tail end.
3. 准备采取（困难或危险的）行动
If you gird your loins, you prepare to do something difficult or dangerous.
1. either side of the backbone between the hipbone and the ribs in humans as well as quadrupeds
Synonym: lumbus
2. a cut of meat taken from the side and back of an animal between the ribs and the rump