This
database is a comprehensive collection of all the American idioms and slang available.
American Idioms are many and varied. We hope you enjoy our collection. We are adding more all the time.
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(Irish) This idiom is used when something is obvious because of the day that it occurs: traffic, for example would be busy around a football stadium on game day, given the day that's in it. On any other day the traffic would be unexplainable, but because its game day its obvious why there is traffic.