This is the 7698th most frequent Russian word.
зарево
A glow in the sky, often from a fire or sunset.
Here, 'зарево' refers to the radiant light observed during early dawn.
На горизонте разлилось яркое утреннее зарево.
A bright morning glow spread across the horizon.
In this context, 'зарево' describes the red glow that remains from a fire.
Пожар оставил после себя густое красное зарево.
The fire left a thick red flare behind.
Here, 'зарево' signifies the diffuse light emanating from a well-lit city at night.