blank slate noun
plural ∼ slates [count] 1 : someone or something that is still in an original state and that has not yet been changed by people, experiences, etc.
▪ She viewed her students as blank slates, just waiting to be filled with knowledge. 2 : something that does not show or express anything
▪ Her expression was a blank slate. [=it did not show any emotion]
▪ She viewed her students as blank slates, just waiting to be filled with knowledge.
▪ Her expression was a blank slate. [=it did not show any emotion]
