G2670–καταποντίζω–katapontizō

But when he saw the wind boisterous, he was afraid; and beginning to sink, he cried, saying, Lord, save me.

καταποντίζεσθαι katapontizesthai “to sink”

But whoever shall cause one of these little ones who believe in me, to sin, it were better for him that a millstone were hanged about his neck, and that he were drowned in the depth of the sea.

καταποντισθῇ katapontisthēa “he may be sunk”