marbles

Short definition from Wiktionary

Noun

1. 1
   Any of several children's games played with small balls (made of marble or more commonly glass).
2. 2
   Sanity.
3. 3
   Bits of rolled-up rubber shed by the tires of race cars that accumulate at the edges of the track, especially at the corners.
4. 4
   plural of marble

Verb

1. 1
   third-person singular simple present indicative of marble

Proper noun

1. 1
   plural of Marble