pron

• (archaic, dialectal, literary, religion) Nominative singular of ye (“you”).
  "[...] Awake thou that sleepest, and arise from the dead, and Christ shall giue thee light."

verb

• (transitive) To address (a person) using the pronoun thou, especially as an expression of contempt or familiarity.
  "Don’t thou them as thous thee! – a Yorkshire English admonition to overly familiar children"
• (intransitive) To use the word thou.
  "The hardcore role-players will wake up one day feeling, like a dead weight on their chest, the strain of endless texting in Renaissance Faire English—yet dutifully go on theeing and thouing all the same."

noun

• (slang) A thousand, especially a thousand of some currency (dollars, pounds sterling, etc.).
  "Whoa there, big spender — that'll cost you a few thou. Are you sure you can afford it?"