left half of the body
Refers to the left side of the body, often used in medical or descriptive contexts.
See also: 右半身
He was left with paralysis on the left half of his body after the accident.
I like to sleep on my left side.
Refers to the lower half of the body, not limited to left/right.
Compound of 左 (ひだり, 'left') + 半身 (はんしん, 'half of the body').