loin /ˈloɪn/ noun
plural loins
plural loins
Learner's definition of LOIN
[count] : an area on the back of an animal's body near the tail
[count, noncount] : meat from this area
loins [plural] : the area of a person's body that includes the sexual organs
◊ Your child or children can be referred to as the fruit of your loins. A child can be described as springing/coming from the loins of his or her parents. These phrases are usually used in a humorous way.

gird (up) your loins

: to prepare yourself for a fight or for some difficult task