The second personal pronoun, in the singular number, denoting the person addressed; thyself; the pronoun which is used in addressing persons in the solemn or poetical style.
Art thou he that should come?
Thou
v. t.
To address as thou, esp. to do so in order to treat with insolent familiarity or contempt.
If thou thouest him some thrice, it shall not be amiss.
Thou
v. i.
To use the words thou and thee in discourse after the manner of the Friends. [R.]