catching fire; fire spreading
Refers to fire moving from one object or place to another, often used in contexts of fire safety or describing how flames spread.
To prevent fire from spreading, please keep flammable items away.
This house also burned down due to the fire spreading from the neighboring house.
Compound of 火 (hi, 'fire') and 移り (utsuri, the continuative form of 移る utsuru, 'to move, shift'). The reading ひうつり reflects the combination of 火 (hi) and 移り (utsuri).