expression, noun which may take the genitive case particle 'no'
skin and bones; nothing but skin and bones
Describes a person or animal that is extremely thin, often from illness or malnutrition. Used as a set phrase, typically with の or in a predicative pattern like 骨と皮だ.
He became nothing but skin and bones because of his illness.
The abandoned dog was in a skin-and-bones condition.
A straightforward compound of 骨 (bone) and 皮 (skin) linked by と (and), literally 'bones and skin'. The phrase is a natural metaphor for extreme thinness.