Sittest Definition
    verb
  
 (archaic) Second-person singular simple present form of sit.
1611, King James Version of the Bible (Authorized Version) Deuteronomy 11:19 And ye shall teach them your children, speaking of them when thou sittest in thine house, and when thou walkest by the way, when thou liest down, and when thou risest up.
 Wiktionary 
Origin of Sittest
-  
sit + -est.
From Wiktionary
 
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