13th cent. From Latin fundere "to pour." The evolution from "pouring" into "sinking" comes from naval war; the word was used as a term for sinking enemy seacraft.
From Proto-Italic *χund-e/o- 'id.' From Proto-Indo-European *ǵhu-n-d- 'id.,' a d-present re-interpreted as a nasal present, but the change from *ǵh- to *χ- in Proto-Italic is unexpected.
Asturian fundir, Galician fundir
Umbrian hondu "throw down," Faliscan huti[c]ilom (?) "vasette?"
Gothic giutan "to pour," Old English gheotan 'id.' (English gush)
Ancient Greek χέω (khéo) "I pour
Armenian jew "mould"
Sanskrit juhóti "pours," Avestan ā-zūiti- "butter," "sacrificial fat"
B ku- "to pour"