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countable and uncountable, plural hostageships
(law, historical) A condition of being held as surety for a pledge, as to appear before a magistrate for trial after release from gaol. quotations
English, Norman and French tradition seem all to point to an ancient and extremely rigorous form of suretyship or hostageship which would have rendered the surety liable to suffer the punishment that was hanging over the head of the released prisoner.
1898, Sir Frederick Pollock, Frederic William Maitland, The history of English law before the time of Edward I, 2nd edition, volume 2, The University Press