make an exception
Exempt someone or something from a general rule or practice, as in Because it's your birthday, I'll make an exception and let you stay up as late as you want. This expression was first recorded about 1391.
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The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.