This infinitive form describes the action of rising up, appearing in Psalm 89:9 in a maritime context about God's sovereignty over the sea. The phrase describes God ruling over the surging of the sea and stilling its waves 'when they rise up.' The image portrays divine control over chaotic, threatening forces—when storm waves rise to destructive heights, God calms them. This participates in the broader biblical theme of God's mastery over chaos waters, establishing order and safety. The rising of waves represents both natural danger and symbolic cosmic rebellion that God alone can subdue.