noun, noun which may take the genitive case particle 'no'
bent over (with age); stooped; shrimp-like posture
Describes a person, especially elderly, whose back is permanently bent forward like a shrimp. Often used with なる or in the phrase 海老腰になる.
祖父は年をとって海老腰になってしまった。
My grandfather has become bent over with age.
海老腰のおばあさんがゆっくり歩いている。
A stooped old woman is walking slowly.
猫背 refers to a hunched back or rounded shoulders (like a cat), often a habitual posture, while 海老腰 specifically describes being bent forward at the waist, typically due to age.
Compound of 海老 (ebi, 'shrimp') and 腰 (koshi, 'waist/back'), from the resemblance of a bent-over posture to the curved shape of a shrimp.