A loophole is an accidental technicality or unclear section of a written document that allows someone to avoid following a rule or fulfilling an obligation. If you've discovered a way to get out of paying taxes on money you made last year, you've found a loophole.

There can also be loopholes in politics, where politicians get away with something through a technicality. And if a criminal goes free despite being found guilty of a crime, it might be because of some unforeseen loophole in the law. The original loopholes were narrow slits in a fortress or wall through which defenders could safely shoot arrows — it was seen as an unfair advantage by some, which resulted in the modern meaning of loophole.

Definitions of loophole

n an ambiguity (especially one in the text of a law or contract) that makes it possible to evade a difficulty or obligation

Type of:
an expression whose meaning cannot be determined from its context

n a small hole in a fortified wall; for observation or discharging weapons

Type of:
an opening deliberately made in or through something