Definitions

1. noun

a soft white substance, usually made from calcium carbonate, used for writing or drawing on a blackboard or for marking lines on a road.

“She picked up a piece of chalk to write the math problems on the board.”

2. verb

to mark or draw something with chalk, especially on a surface such as a blackboard or pavement.

“Someone chalked the playing field with white lines to designate the different areas.”

3. verb

to estimate or guess the chances of winning or losing something, especially a game or competition.

“They chalked up their chances of winning the championship to about 50-50.”