If the river were dry I could fill it with tears which figure of speech?

The phrase "If the river were dry I could fill it with tears" employs hyperbole, as it exaggerates the speaker's emotional state by suggesting that their tears could fill an entire river. This figure of speech emphasizes the depth of their sorrow or grief, illustrating how overwhelming their emotions are. Additionally, it evokes vivid imagery, contrasting the vastness of a river with the personal experience of loss or sadness.