not cricket
Unfair, unsportsmanlike, as in It's not cricket to let him go without notice. This term, in which the sport of cricket is equated with upright behavior, survives in America despite the relative unfamiliarity of the sport there. [Mid-1800s]
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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.