The Hebrew verb suph means to come to an end, to cease, or to be consumed. It conveys final termination — the complete ending of something. The word appears rarely but in significant contexts of finality. Note: the noun suph (reeds/rushes) is a different word, though Yam Suph (Sea of Reeds) resonates with an ending place.
Esther 9:28 uses suph powerfully: Purim 'will never cease from their descendants.' Zephaniah 1:18 warns God 'will make a sudden end (suph) of all who live in the earth.' Theologically, suph reminds us all earthly things end — kingdoms, generations, human plans. Only God's word endures without suph (Isaiah 40:8).