We don't have synonyms for extreat yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are entreat, extream and estreat.
(v) :
Obsolete form of estreat. [(law, transitive) To extract or take out from the records of a court, and send up to the court of exchequer to be enforced; said of a forfeited recognizance.]
(v) :
Obsolete form of estreat. [(law, transitive) To extract or take out from the records of a court, and send up to the court of exchequer to be enforced; said of a forfeited recognizance.]