loophole
noun
a means of escape or evasion; a means or opportunity of evading a rule, law, etc..
Used to express a completed action that took place before another specific past action occurred.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The Arabs had loopholed the walls and surrounded the building with rifle-pits.
From The Dash for Khartoum A Tale of Nile Expedition by Joseph Nash