chalk talk

noun
a talk or lecture in which the speaker illustrates points by drawing on a blackboard: The coach gave a chalk talk before the big game.

Origin:
1830–40, Americanism

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World English Dictionary
chalk talk
 
n
(US), (Canadian) an informal lecture with pertinent points, explanatory diagrams, etc, shown on a blackboard

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
At the blackboard, a supervisor is giving a chalk talk about how to bow.
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