icing on the cake
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Also, frosting on the cake. An additional benefit to something already good. For example, All these letters of congratulation are icing on the cake, or After that beautiful sunrise, the rainbow is just frosting on the cake. This metaphoric expression alludes to the sweet creamy coating used to enhance a cake. [Mid-1900s]
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Which of the following nouns has an irregular plural form?
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The American Heritage® Idioms Dictionary
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