A loophole in the law is a small mistake which allows people to do something that would otherwise be illegal.
例句
It is estimated that 60,000 shops open every Sunday and trade by exploiting some loophole in the law to avoid prosecution.據(jù)估計(jì)，每逢周日開門營業(yè)的店鋪有6萬家，通過鉆法律漏洞躲避檢控。
英漢詞典釋義
n.
漏洞, 空子
They tightened the loopholes in those acts.他們堵住了那些法案中的漏洞。
英英詞典釋義
Noun
1. an ambiguity (especially one in the text of a law or contract) that makes it possible to evade a difficulty or obligation
2. a small hole in a fortified wall; for observation or discharging weapons