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Entry 5 senses · 2 variants Webster, 1913

Chalk

/(cha̤k)/ · IPA /t͡ʃɔːk/
01 n. A soft, earthy substance, of a white, grayish, or yellowish white color, consisting of calcium carbonate, and having the same composition a…
  1. 1.
    A soft, earthy substance, of a white, grayish, or yellowish white color, consisting of calcium carbonate, and having the same composition as common limestone.(Min.)
  2. 2.
    Finely prepared chalk, used as a drawing implement; also, by extension, a compound, as of clay and black lead, or the like, used in the same manner. See Crayon.(Fine Arts) See: Crayon
Phrases & compounds
Black chalk — a mineral of a bluish color, of a slaty texture, and soiling the fingers when handled; a variety of argillaceous slate.
By a long chalk — by a long way; by many degrees.
Chalk drawing — a drawing made with crayons. See Crayon.
Chalk formation — See Cretaceous formation, under Cretaceous.
Chalk line — a cord rubbed with chalk, used for making straight lines on boards or other material, as a guide in cutting or in arranging work.
Chalk mixture — a preparation of chalk, cinnamon, and sugar in gum water, much used in diarrheal affection, esp. of infants.
Chalk period — See Cretaceous period, under Cretaceous.
Chalk pit — a pit in which chalk is dug.
Drawing chalk — See Crayon, n., 1.
French chalk — steatite or soapstone, a soft magnesian mineral.
Red chalk — an indurated clayey ocher containing iron, and used by painters and artificers; reddle.
02 v. t. To rub or mark with chalk.
imp. & p. p. Chalked; p. pr. & vb. n. Chalking
  1. 1.
    To rub or mark with chalk.
  2. 2.
    To manure with chalk, as land.
  3. 3.
    To make white, as with chalk; to make pale; to bleach.
    “Let a bleak paleness chalk the door.” — Herbert.
Phrases & compounds
To chalk out — to sketch with, or as with, chalk; to outline; to indicate; to plan.