1
a
: a soft white, gray, or buff limestone composed chiefly of the shells of foraminifers
b
: a prepared form of chalk or a material resembling chalk especially when used (as for writing on blackboards) as a crayon
2
a
: a mark made with chalk
b
British
: a point scored in a game
chalked; chalking; chalks
1
: to write or draw with chalk
2
: to rub or mark with chalk
: to become chalky
the paint had begun to chalk
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Merriam-Webster unabridged
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