fire and water; flooding and fire
Refers to the two elements together, often in the context of disasters or insurance coverage. The second gloss 'flooding and fire' is a common extension in disaster-related contexts.
This insurance covers fire and water damage.
Many houses were seen that had suffered fire and flood damage.
ji ji; chi chi; Hexagram 63 of the I Ching: After Completion
complete incompatibility; like water and oil
Compound of 水 (water) and 火 (fire). The reading すいか is the on'yomi of both characters.