noun which may take the genitive case particle 'no', noun
naked above the waist; shirtless; stripped to the waist
Describes a state where the upper body is bare; often used in contexts like summer heat, physical labor, or medical examinations.
Because it was hot, he did the yard work shirtless.
Please strip to the waist for the examination.
裸 means 'naked' in general, while 上半身裸 specifies 'naked from the waist up'.
半裸 means 'half-naked' and can refer to either upper or lower body, whereas 上半身裸 explicitly means the upper body is bare.
Compound of 上半身 (upper body) + 裸 (naked).