Definition of chalk noun from the Oxford Advanced American Dictionary

     

    chalk

     noun
    noun
    NAmE//tʃɔk//
     
     
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  1. 1[uncountable] a type of soft white stone chalk cliffs
  2. 2[uncountable, countable] a substance similar to chalk made into white or colored sticks for writing or drawing a piece/stick of chalk drawing diagrams with chalk on the blackboard a box of colored chalks
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