cake walk

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A type of dance originating in the United States in the 19th century.
• noun From the mid 1900s, a game at a fair or party in which people walk around a numbered circle along to music. When the music is stopped, the caller draws a number from a jar and whoever is standing on or closest to that number that number wins a cake.
• noun idiomatic Something extremely easy.