| 1. | a soft, white, powdery limestone consisting chiefly of fossil shells of foraminifers. |
| 2. | a prepared piece of chalk or chalklike substance for marking, as a blackboard crayon. |
| 3. | a mark made with chalk. |
| 4. | a score or tally. |
| 5. | to mark or write with chalk. |
| 6. | to rub over or whiten with chalk. |
| 7. | to treat or mix with chalk: to chalk a billiard cue. |
| 8. | to make pale; blanch: Terror chalked her face. |
| 9. | (of paint) to powder from weathering. |
| 10. | of, made of, or drawn with chalk. |
| 11. | chalk up,
|

chalk up
Score or earn, as in She chalked up enough points to be seeded first in the tournament. This term alludes to recording accounts (and later, scores) in chalk on a slate. [c. 1700]
Credit or ascribe, as They chalked their success up to experience. [First half of 1900s]