child's play

Patterned after German Kinderspiel, French jeu d'enfant, Italian gioco da bambini, Italian gioco da ragazzi.

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child's play (uncountable)

1. (idiomatic) Something particularly simple or easy.

   Compared to my last job, this is child's play.

   • 2015 August 18, Robert Frost, The Road Not Taken and Other Poems: (Penguin Classics Deluxe Edition) (Penguin Classics Deluxe Edition)‎, Penguin, →ISBN, →OCLC, page 51:

     And then he'd crow as if he thought that child's play The only fun he had. I've heard them say, though, They found a way to put a stop to it. He was before my time—I never saw him; But the pen stayed exactly as it was There in the upper chamber in the ell, A sort of catch-all full of attic clutter. […]

2. Used other than figuratively or idiomatically: the play of a child.

• kid stuff

• easy as pie
• piece of cake
• easy peasy