Idiom: A Piece of Cake Posted on 23rd January 201822nd January 2018 by DoubleClick A Piece of Cake: A task that can be accomplished very easily. Example: I’m sure the test next week will be a piece of cake for me. I’ve been studying for a long time! Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related Posted in Idiom and tagged Idiom.