Pronunciation: (chôk),[key] —n. 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.
—v.t. 1. to mark or write with chalk.
2. to rub over or whiten with chalk.
3. to treat or mix with chalk: to chalk a billiard cue. 4. to make pale; blanch: Terror chalked her face.
—v.i. 1. (of paint) to powder from weathering.
2. chalk up, a. to score or earn: They chalked up two runs in the first inning. b. to charge or ascribe to: It was a poor performance, but may be chalked up to lack of practice.