The term 'Biblical Verb with 'THOU'' refers to verbs that are used in the Bible and include the word 'THOU'. The four crossword solutions for this term are 'Dost' (4 letters), 'Doest' (5 letters), 'Sayst' (5 letters), and 'Hast' (4 letters), and 'Wast' (4 letters). These verbs are all conjugations of the verb 'to do' and are used in the King James Version of the Bible. They are used to express commands, questions, and statements in a formal and respectful manner.