frosting on the cake

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.

noun

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