adverb taking the 'to' particle
Describes the sound or motion of water splashing around, often in a carefree or vigorous way. Used adverbially with と.
子供たちが水たまりでざぶざぶと遊んでいる。
The children are splashing around in the puddle.
彼はバケツの水をざぶざぶとこぼした。
He sloshed the water out of the bucket.