All 4 Uses

loophole
in
The Blind Side, by Michael Lewis
(Auto-generated)

He went looking for a loophole and quickly found one: Beginner's Spanish.†
p. 209.6 *

loophole = a gap in a rule, allowing avoidance of the rule's core intent
That's when Sean discovered, deep in the recesses of the NCAA rules, yet another loophole: the student-athlete was allowed to generate fresh new grades for himself right up until August 1, so long as that student-athlete was "Learning Disabled."†
p. 210.7
That was another loophole Sean had found.†
p. 221.9
One of the lessons he had picked up from his own career as an NCAA student-athlete was that good enough grades were available to anyone who bothered to exploit the loopholes.†
p. 209.5

Definitions:

(1) (loophole)
a gap in a rule, allowing avoidance of the rule's core intent -- especially in the text of a law or contract
(2) (meaning too rare to warrant focus)
Less commonly, loophole can refer to a small opening in a castle that provides light and air, and allows an arrow to be fired from within. The opening is narrow enough that it is largely protects from incoming arrows.