be a piece of cake

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be a piece of cake

To be a very easy task or accomplishment. I thought I was going to fail the test, but it turned out to be a piece of cake!
See also: cake, of, piece
References in classic literature ?
One day her mother said to her: 'Come, Little Red-Cap, here is a piece of cake and a bottle of wine; take them to your grandmother, she is ill and weak, and they will do her good.
Michelle Brown is finding her new post at aluminium smelting plant Alcan, at Lynemouth, is a piece of cake.