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a long dozen
Thirteen, i.e., one more than a usual dozen (12). When Jacob went to the bakery to buy doughnuts for the office, he made sure to get a long dozen so he could have one to himself on the way to work. They have a sale on at the moment—a long dozen onion and garlic bagels for just $8.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
n. thirteen; a baker’s dozen. They used to give you a long dozen in that bakery.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.