—used as a singular form of “you” when it is the subject of a verb
Full Definition of THOU
: the one addressed <thou shalt have no other gods before me — Exodus 20:3(Authorized Version)> —used especially in ecclesiastical or literary language and by Friends as the universal form of address to one person — compare thee, thine, thy, ye, you
:you<“But can thou do a true enchantment?” — Jon Scieszka, Knights of the Kitchen Table>Hint:Thou is a very old word that still appears in books and sayings from long ago. People also use it to imitate that old way of speaking.