chalk

A soft, white, powdery limestone.

A piece of chalk, or nowadays processed compressed gypsum, that is used for drawing and for writing on a blackboard.

Tailor's chalk.

A white powdery substance used to prevent hands slipping from holds when climbing, sometimes but not always limestone-chalk.

A platoon-sized group of airborne soldiers.

(horseracing) The favorite in a sporting event.

The prediction that there will be no upsets, and the favored competitor will win.

To apply chalk to anything, such as the tip of a billiard cue.

To record something, as on a blackboard, using chalk.

To use powdered chalk to mark the lines on a playing field.

To record a score or event, as if on a chalkboard.

To manure (land) with chalk.

To make white, as if with chalk; to make pale; to bleach.