Where does “child's play” come from?

child's play (English) comes from English Child, from Middle English childen, from Middle English -en, from Old English -en, from Old Norse -inn, from Proto-Norse -īna-, from Proto-Germanic -īnaz, from Proto-Indo-European -iHnos — adjectival suffix.

child's play (English): Something particularly easy or simple

Definitions

  1. Something particularly easy or simple

Ancestry of “child's play”, step by step

child's play traces back through two separate lines of ancestry.

via English Child

StepLanguageWordMeaning
1EnglishChildAlternative letter-case form of child "often used...
2Middle EnglishchildenTo deliver a child; to beget or procreate; To...
3Middle English-enDenotes the past participle form when attached to...
4Old English-enmæġþ + API → mæġden; cocc + API → cycen, cicen;...
5Old Norse-innUsed to create adjectives from nouns, meaning...
6Proto-Norse-īna-
7Proto-Germanic-īnaz-en
8Proto-Indo-European-iHnosCreates adjectives of materials
9Proto-Indo-European-no-adjectival suffix

via English play

StepLanguageWordMeaning
1EnglishplayTo act in a manner such that one has fun; to...
2Middle EnglishpleyeHappiness, mirth, jolliness, or gaiety; Fun,...
3Old Englishpleġaexercise
4Proto-West Germanicplegōcare; an exercise; a game
5Proto-West GermanicCreates adverbs from adjectives; Creates agent...
6Proto-Germanic-ly; Forms agent nouns, often from the zero-grade...
7Proto-Indo-EuropeanDerives nouns from roots
Every word from Proto-Indo-European -no-Every word from Middle English -enEvery word from Proto-Germanic -īnaz