noun
bent back; stooping back
Describes a back that is bent or stooped, often due to age or poor posture. The term literally means 'double-layered waist', evoking a folded appearance.
祖母は二重腰で歩くのが少し大変そうだ。
My grandmother walks with a stooped back and seems to have a bit of difficulty.
長年のデスクワークで二重腰になってしまった。
Years of desk work have given me a bent back.