body engulfed in flames; completely on fire
Vivid expression likening a person whose entire body is on fire to a daruma doll being ritually burned. Used in news, literature, or dramatic description.
事故で車が炎上し、運転手は全身火だるまになった。
The car burst into flames in the accident, and the driver was engulfed in flames from head to toe.
全身火だるまで逃げ惑う人の姿が目撃された。
A person running around completely on fire was witnessed.
Compound of 全身 (whole body) + 火だるま (person on fire, from 火 'fire' + だるま 'daruma doll', referring to the ritual burning of daruma dolls). The exact origin of the 火だるま expression is uncertain, but it is a vivid metaphor.