child's play

noun

1. something very easily done.

child's play

noun

1. informal.
   something that is easy to do

Word History and Origins

Origin of child's play¹

Middle English word dating back to 1350–1400

Idioms and Phrases

Something easily done, a trivial matter. For example, Finding the answer was child's play for Robert , or The fight we had was child's play compared to the one I had with my mother! Originating in the early 1300s as child's game , the idiom was already used in its present form by Chaucer in The Merchant's Tale: “It is no child's play to take a wife.”