Language Comprehension — quick quiz

Read the passage carefully and answer the question that follows. "The river was a source of life for the village. Every morning, women would gather at its banks to wash clothes and fill their pitchers with fresh water. Children played in the shallow parts while fishermen cast their nets hoping for a good catch. The river connected the village to the nearby town, and small boats carried goods and passengers daily. But during the monsoon, the same gentle river would transform into a raging torrent, flooding fields and homes." What does the word 'transform' mean in the context of the passage?