/ˈluːphoʊl/
loop·hole
BrE /ˈluːphəʊl/
NAmE /ˈluːphoʊl/
~ (in sth)
a mistake in the way a law, contract, etc. has been written which enables people to legally avoid doing sth that the law, contract, etc. had intended them to do
a legal loophole
to close existing loopholes