Definition of “thou”

pronoun:
- You singular informal, nominative case.
  
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verb:
- To address (a person) using the pronoun thou, especially as an expression of familiarity or contempt.
  
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- To use the word thou.
  
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noun:
- A unit of length equal to one-thousandth of an inch.
  
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- A thousand, especially a thousand dollars, a thousand pounds sterling, etc.
  
  from Wiktionary, Creative Commons Attribution/Share-Alike License