The Collaborative International Dictionary of English v.0.48:

Estreat \Es*treat"\, v. t. [imp. & p. p. Estreated; p. pr. &
   vb. n. Estreating.] (Law)
   (a) 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.
   (b) To bring in to the exchequer, as a fine.
       [1913 Webster]