to swear, vow
From Latin jūrāre, iūrāre (“to swear or take an oath”), from Proto-Italic *jowezāō, from Proto-Indo-European *h₂yew-es-eh₂-ye-, derived from the root *h₂yew- (“justice”, “law”).
Practice speaking and memorizing "giurare" and many other words and sentences in Italian.