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Latin word sponsare comes from Proto-Indo-European *pend-, and later Proto-Italic *spondeō (To promise, to pledge.)
*pend- (Proto-Indo-European)
*spondéyeti (Proto-Indo-European)
*spondeō (Proto-Italic)
To promise, to pledge.
spondeo (Latin)
I guarantee. I promise for another; I become security for a person, enter bail.. I promise or engage in marriage, betroth.. I promise, bind or pledge myself, contract, vow.