What is "boy's play"

Boy \Boy\, n. [Cf. D. boef, Fries. boi, boy; akin to G. bube, Icel. bofi rouge.]

1. A male child, from birth to the age of puberty; a lad; hence, a son.

   My only boy fell by the side of great Dundee.
   --Sir W. Scott.

   Note: Boy is often used as a term of comradeship, as in college, or in the army or navy. In the plural used colloquially of members of an associaton, fraternity, or party.

2. In various countries, a male servant, laborer, or slave of a native or inferior race; also, any man of such a race; -- considered derogatory by those so called, and now seldom used. [derog.]

   He reverted again and again to the labor difficulty, and spoke of importing boys from Capetown.
   --Frances Macnab.

   Boy bishop, a boy (usually a chorister) elected bishop, in old Christian sports, and invested with robes and other insigni

   1. He practiced a kind of mimicry of the ceremonies in which the bishop usually officiated.

      The Old Boy, the Devil. [Slang]

      Yellow boys, guineas. [Slang, Eng.]

      Boy's love, a popular English name of Southernwood ( Artemisia abrotonum); -- called also lad's love.

      Boy's play, childish amusements; anything trifling.