Noun
lower back (plural lower backs)
The region of the back above the waist, also known as the lumbar region; the area surrounding the five vertebrae between the rib cage and the pelvis.
I went to this tattoo parlor in the East Village and I got an outline of a violin on my lower back. They call them tramp stamps now. Katherine Moennig
For the record, I don't deserve this. But I have lower back pain and don't deserve that either. (After being listed as one of the twenty most brilliant living Christian Professors. Originally sourced to Jack Benny.) Robert J. Marks II
Prolonged sitting can cause stiffness in your lower back. Denise Austin