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chalk

1 chalk /ˈtʃɑːk/ noun
plural chalks
1 chalk
/ˈtʃɑːk/
noun
plural chalks
Britannica Dictionary definition of CHALK
[noncount] : a type of soft, light-colored rock
◊ Chalk is a kind of limestone.
[noncount] : a substance that is made into white or colored sticks and used for writing or drawing
[count] : a piece of chalk

not by a long chalk

British
: not at all

— chalky

/ˈtʃɑːki/ adjective chalkier; chalkiest [also more chalky; most chalky]
2 chalk /ˈtʃɑːk/ verb
chalks; chalked; chalking
2 chalk
/ˈtʃɑːk/
verb
chalks; chalked; chalking
Britannica Dictionary definition of CHALK
[+ object]
: to write or draw (something) with chalk
: to mark (something) with chalk

chalk up

[phrasal verb]
chalk (something) up or chalk up (something)
: to earn or achieve (something) : to accumulate (something)
British : to charge (the cost of drinks or food) to your account to be paid for later
chalk (something) up to (something) chiefly US : to explain (something) by stating its cause : to say that (something) was caused by (something)