Definitions from Wiktionary (Chalk)

▸ noun:  (uncountable) A soft, white, powdery limestone (calcium carbonate, CaCO₃).
▸ noun:  (countable) A piece of chalk, or nowadays processed compressed gypsum (calcium sulfate, CaSO₄), that is used for drawing and for writing on a blackboard (chalkboard).
▸ noun:  Tailor's chalk.
▸ noun:  (uncountable, climbing, gymnastics) A white powdery substance used to prevent hands slipping from holds when climbing, or losing grip in weight-lifting or gymnastics, sometimes but not always limestone-chalk, often magnesium carbonate (MgCO₃).
▸ noun:  (US, military, countable) A platoon-sized group of airborne soldiers.
▸ noun:  (US, sports, chiefly basketball, horse racing) The favorite in a sporting event.
▸ noun:  (US, sports, chiefly basketball) The prediction that there will be no upsets, and the favored competitor will win.
▸ verb:  To apply chalk to anything, such as the tip of a billiard cue.
▸ verb:  To record something, as on a blackboard, using chalk.
▸ verb:  To use powdered chalk to mark the lines on a playing field.
▸ verb:  (figuratively) To record a score or event, as if on a chalkboard.
▸ verb:  To manure (land) with chalk.
▸ verb:  To make white, as if with chalk; to make pale; to bleach.
▸ noun:  A surname.
▸ noun:  A suburban village attached to the east side of Gravesend, Gravesham borough, Kent, England (OS grid ref TQ6773).
▸ Also see chalk

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