Knuckle month

knuckle month
col. 1. A month with 31 days. 2. Informal: a month that has one extra payweek, or a month that spans 5 weeks instead of 4.
ex – “August of 2006 is a true knuckle month”

Origin: Called after the world famous ‘knuckle month trick’, a trick not too many people are aware of.

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