What is the meaning of marbles?

noun

• A hard crystalline metamorphic rock that takes a high polish; used for sculpture and as building material.
  • synonyms: marble
• A small ball of glass that is used in various games.
  • synonyms: marble
• A sculpture carved from marble.
  • synonyms: marble
• A children's game played with little balls made of a hard substance (as glass. )
• The basic human power of intelligent thought and perception.
  • usage: "he used his wits to get ahead"; "I was scared out of my wits"; "he still had all his marbles and was in full possession of a lively mind"
  • synonyms: wits

verb

• Paint or stain like marble.
  • usage: "marble paper"
  • synonyms: marble