loophole
noun [ C ] uk/ˈluːp.həʊl/ us/ˈluːp.hoʊl/
（协议或法律的）漏洞，空子，破绽
a small mistake in an agreement or law that gives someone the chance to avoid having to do something
tax loopholes 税法的漏洞
The company employed lawyers to find loopholes in environmental protection laws. 该公司雇用律师来寻找环境保护法的漏洞。