icing on the cake

frosting

[fraw-sting, fros-ting]
noun
1.
a sweet mixture, cooked or uncooked, for coating or filling cakes, cookies, and the like; icing.
2.
a dull or lusterless finish, as on metal or glass.
3.
a process of highlighting the hair by bleaching selected strands.
4.
a material used for decorative work, as signs, displays, etc., made from coarse flakes of powdered glass.
Idioms
5.
the frosting on the cake, something added to make a thing better or more desirable. Also, icing on the cake.

Origin:
1610–20; frost + -ing1

nonfrosting, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
frosting (ˈfrɒstɪŋ)
 
n
1.  a soft icing based on sugar and egg whites
2.  Also called: icing a sugar preparation, variously flavoured and coloured, for coating and decorating cakes, biscuits, etc
3.  a rough or matt finish on glass, silver, etc
4.  slang the practice of stealing a car while the owner has left it idling to defrost the windows and heat the engine

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

frosting
1610s as an action; 1750s as a substance; meaning "cake icing" is from 1858; from prp. of frost.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

frost (frôst)
n.
A deposit of minute ice crystals formed when water vapor condenses at a temperature below freezing.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
frost   (frôst)  Pronunciation Key 
A deposit of tiny, white ice crystals on a surface. Frost forms through sublimation, when water vapor in the air condenses at a temperature below freezing. It gets its white color from tiny air bubbles trapped in the ice crystals. See more at dew point.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Idioms & Phrases

icing on the cake

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]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Synonyms
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