喉が渇いてきました

The phrase combines '喉' (nobo) meaning 'throat', '渇く' (kawaku) meaning 'to get dry or thirsty', and 'てくる' (tekuru) which is a grammatical construction indicating that an action or state has started and is continuing, or has come to be. So, literally 'throat has started to dry' or 'thirst has come upon me'. The origin of the individual components is ancient Japanese. '喉' has roots in Old Japanese, possibly related to sounds of swallowing. '渇く' also has ancient origins, appearing in early Japanese texts, signifying a state of dryness or desire for water. The auxiliary verb 'くる' (kuru), meaning 'to come', is fundamental to Japanese grammar and has been used in this progressive sense for centuries.