A curved, bow-shaped window space projecting outward from the main walls of a building, similar to a bay window.
A slit in a castle wall; today, any similar window for shooting a ranged weapon or letting in light. Also written loop hole.
A method of escape, especially an ambiguity or exception in a rule or law that can be exploited in order to avoid its effect.
To exploit (a law, etc.) by means of loopholes.
To prepare a building for defense by preparing slits or holes through which to fire on attackers