Meaning

verb cut off the testicles (of male animals such as horses)

originFrom Middle English geld and reinforced by Medieval Latin geldum, both from Old English geld, ġield (“payment, tribute”), from Proto-West Germanic *geld, from Proto-Germanic *geldą (“reward, gift, money”), from Proto-Indo-European *gʰeldʰ- (“to pay”). Probably reinforced by gelt (which see), see Norwegian Bokmål gjeld (“debt”), Danish gæld (“debt”). Geld is also written gelt or gild, and as such…

Etymology from Wiktionary, CC BY-SA 3.0