1.
spreading fire, flying sparks
Fire that spreads by sparks or embers flying to a new location.
隣の家に飛び火した。
The fire spread to the neighboring house.
強風で火の粉が飛んで、離れた建物にも飛び火した。
Sparks carried by strong wind spread the fire to a building some distance away.
2.
spreading (of trouble, scandal, conflict)
A problem or conflict that spreads from its original source to affect other areas or people.
海外の経済危機が日本にも飛び火した。
The overseas economic crisis spread to Japan as well.
スキャンダルが関係者にまで飛び火した。
The scandal spread to those associated with it.
二国間の紛争が周辺国に飛び火しないか懸念されている。
There are concerns that the bilateral conflict could spread to neighboring countries.
3.
impetigo
A contagious skin infection common in children, so called because it spreads quickly like flying fire.
子どもが飛び火にかかった。
The child got impetigo.
飛び火は早めに治療しないと広がる。
Impetigo will spread if not treated early.
プールの季節は飛び火が流行りやすいので注意が必要だ。
Impetigo tends to spread easily during pool season, so caution is needed.
USAGE:
Senses 1 and 2 are commonly used as a verb with する: 飛び火する (to spread [of fire/trouble]). Sense 2 is a metaphorical extension very common in news reporting.
Sense 3 is the medical term for impetigo (伝染性膿痂疹), named for how quickly the infection spreads across the skin.
COMMON COLLOCATIONS:
- 飛び火する: to spread (fire/trouble)
- 飛び火を防ぐ: to prevent spreading
- 飛び火にかかる: to catch impetigo