chalk, n.Definitions

Chalk is trillions of microscopic plankton fossils

Chalk is a deposit found at the top, bottom and middle and in the space between the bottom and middle and between the middle and top of American literature.

Chalk is a deposit found at the top, bottom and middle and in the space between the bottom and middle and between the middle and top of American literature. (Chalk-line, used generally in the phrase, "to walk a chalk-line"; E. g., the shortest way to reach the poor-house is to walk the chalk-line of probity).