Marbles
Mind, reason, wits.
Brain cells.
For example: To lose one's marbles.
Definition from the English-Bulgarian Dictionary:
Marble [ma:bl]:
- Marble.
- pl. Marble, a collection of marble statues, a sculptural group made of marble.
- A game marble.
- attr. Marble, white as marble, with marble veining, fig. hard, stiff, unfeeling.
- To paint or streak (wood, etc.) to resemble marble.
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