BT BM 70a(27) :מבקינן גברא דאית ליה דהבא פריכא ונקיטינן מיניה במשכנתא‏ : we search for a man who has some broken gold and take it from him as a pledge (for the orphan's money)
See the entire entry for mšknh n.f. a loan transaction secured by real property