chalk
US /tʃɑːk/
UK /tʃɑːk/
1.
a soft, white, porous sedimentary carbonate rock, a form of limestone composed of the mineral calcite
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The teacher wrote on the blackboard with chalk.
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The cliffs along the coast are made of white chalk.
2.
a substance, typically magnesium carbonate, used in powdered form by gymnasts and other athletes to dry the hands and improve grip
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The gymnast applied chalk to her hands before her routine.
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Climbers often use chalk to improve their grip on rocks.
1.
to mark, draw, or write with chalk
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He chalked a line on the pavement.
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The score was chalked up on the board.