loophole

A slit in a castle wall; today, any similar window for shooting a ranged weapon or letting in light.

[…] and having a fair loophole, as it were, from a broken hole in the tree, he took a sure aim, without being seen, waiting till they were within about thirty yards of the tree, so that he could not miss.

There was a loophole in this wall, to let the light in, just at the height of a person's head, who was sitting near the chimney.

A method of escape, especially an ambiguity or exception in a rule or law that can be exploited in order to avoid its effect.

Coupling the poor girl's intelligence with my previous knowledge, and the result of our good friend's inquiries on the spot, I left him no loophole of escape, and laid bare the whole villany which by these lights became plain as day.

You have a contract that says you will work until Island Towers is finalized, which I interpret as completion of construction, or I can stop you working elsewhere. And there's no loopholes, because you drafted it and you're the best.

To prepare a building for defense by preparing slits or holes through which to fire on attackers

The lower windows were barricaded, and the whole building loopholed for musketry fire.

The doors were barricaded, the shutters closed upon the windows and loopholed, and provisions were brought in from the outhouses.

To exploit (a law, etc.) by means of loopholes.

Abroad they had developed loopholing the law into an art; in Israel they jettisoned loopholing for ignoring the law wherever possible. Obeying laws was for naive fools.

De-moralizing the subject can be, quite simply, demoralizing, as stirring statements of ideals turn into persnickety rules with exceptions crying out to be loopholed.