mistutoring

/ˌmɪsˈtuːtərɪŋ/
noun
  1. The act of teaching or instructing someone incorrectly or poorly.
    • The student's confusion was a result of mistutoring by an unqualified teacher.
    • The school investigated claims of mistutoring in the math department.
    • Mistutoring can cause long-term misunderstandings in a subject.
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