Word Study
piece of cake
WORDNET DICTIONARY
Noun piece of cake has 1 sense
- piece of cake(n = noun.act) breeze, child's play, cinch, duck soup, picnic, pushover, snap, walkover - any undertaking that is easy to do; "marketing this product will be no picnic" has particulars: doddle
is a kind of labor, project, task, undertaking
For further exploring for "piece of cake" in Webster Dictionary Online