1º_ It is a term related to the blackboard in its various meanings. How to work that mineral to obtain it or shape it. Or do design on advertising boards. Or in sports referred to the scorer (which was formerly a blackboard), as a ruse to alter the points, or making a more lucid game, more carefree because the many are very much in favor of the player. 2º_ It can also be an inflection of the verb slate for the action of any of the previous definitions. See verbs/blackboard.
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