Definition of heat lightning in English:
A flash or flashes of light seen near the horizon, especially on warm evenings, believed to be the reflection of distant lightning on high clouds.
- When they would go into the cloud, you could see flashes like heat lightning.
- I sat out and watched a spectacular display of heat lightning while the warm wind roared in the treetops.
- There is a line in one of his poems saying that flashes of heat lightning are ‘like deaf and dumb demons conversing with each other.’