This is the 7655th most frequent Korean word.
펑펑
"펑펑" means "bursting or streaming profusely" (e.g., tears or water).
In this sentence, '펑펑' describes how the snow falls in a continuous and abundant manner.
눈이 펑펑 내렸다.
The snow fell heavily.
Here, '펑펑' portrays the action of crying heavily and uncontrollably.
펑펑 울지 말고 이야기를 해 보세요.
Instead of crying profusely, try talking about it.
In this context, '펑펑' emphasizes the vigorous and unceasing flow of water from the pump.