Definition of icing noun from the Oxford Advanced American Dictionary

 

icing

 noun
noun
NAmE//ˈaɪsɪŋ//
 
[uncountable]
 
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  • a sweet mixture of sugar and water, milk, or egg white that is used to cover and decorate cakes synonym frosting
  • Idioms
    the icing/frosting on the cake
     
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    something extra and not essential that is added to an already good situation or experience and that makes it even better It's an added bonus—the icing on the cake.
    See the Oxford Advanced Learner's Dictionary entry: icing