loophole - definition and synonyms

noun [countable] 

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  1. something that has been left out of a law or legal document that people can use to avoid obeying it
    close a loophole in something (=correct it):

    The new law has closed a loophole that enabled rich corporations to pay no tax.

Word story
The original meaning of loophole was a long narrow window in the wall of a castle, through which arrows could be fired against attackers. It acquired its modern meaning in the late 17th century.