This is the 476th most frequent Marathi word.
भरभर
Quickly or rapidly.
In this sentence, 'भरभर' indicates speed and urgency in the action of writing.
ती भरभर लिहित होती.
She was writing hastily.
Here, 'भरभर' describes the intensity and rapid occurrence of rain.
पाऊस भरभर कोसळला.
The rain poured down vigorously.
In this context, 'भरभर' emphasizes the quickness of her action.