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English definition of “substitute teacher”

substitute teacher

noun [C]  /ˈsʌb·stɪˌtut ˈti·tʃər/ (short form sub, substitute,    /ˈsʌb·stɪˌtut/)
a teacher who replaces another teacher who is absent from work : We had a substitute in math yesterday .
(Definition of substitute teacher noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
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