chalk talk

noun
🔊/ˈtʃɔːk tɔːk/
🔊/ˈtʃɔːk tɔːk/
(North American English)
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  1. a talk or lecture, especially one given by a sports coach to a team, in which the speaker draws diagrams on a board to explain particular points
    • a pre-game chalk talk赛前粉笔谈话