baker’s dozen

noun
🔊/ˌbeɪkəz ˈdʌzn/
🔊/ˌbeɪkərz ˈdʌzn/
[singular] (old-fashioned)
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  1. a group of thirteen (= one more than a dozen, which is twelve)十三
    Word OriginThis phrase comes from bakers’ old custom of adding one extra loaf to an order of a dozen.