noun
plural chalks
[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
Brit :not at all
verb
chalks; chalked; chalking
[+ obj] 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)
Brit :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)