noun
(historical) A slit in a castle wall; today, any similar window for shooting a ranged weapon or letting in light.
(figurative) A method of escape, especially an ambiguity or exception in a rule or law that can be exploited in order to avoid its effect.
verb
(military, transitive) To prepare a building for defense by preparing slits or holes through which to fire on attackers
(transitive) To exploit (a law, etc.) by means of loopholes.
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