口渴的英语表达可以是"thirsty"。例如:"I am thirsty and need a drink of water." 另外,也可以用"parched"来形容极度口渴的感觉。例如:"After running the marathon, my mouth felt parched and I desperately needed some water." 另外,如果是形容想要喝某种饮料的口渴感觉,可以使用"craving",例如:"I am craving a cold soda because I am so thirsty."