Definition of chalk verb from the Oxford Advanced American Dictionary

 

chalk

 verb
verb
NAmE//tʃɔk//
 
chalk something (up) (on something)Verb Forms present simple I / you / we / they chalk
 
he / she / it chalks
 
past simple chalked
 
-ing form chalking
 
 
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to write or draw something with chalk She chalked (up) the day's menu on the board. A message was chalked on the door—“Back at 11 o'clock.” a chalked outline of a human body The scores were chalked up on the wall. Phrasal Verbschalk up somethingchalk something up to something
Idioms
put something down to experience(also chalk something up to experience)
 
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used to say that someone should think of a failure as being something that they can learn from We lost a lot of money, but we just chalked it up to experience.
See the Oxford Advanced Learner's Dictionary entry: chalk