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no object To work as a substitute teacher. Also with object: to teach (a lesson, subject, etc.) as a substitute teacher.
1950s. From substitute + teach, after substitute teacher.
substitute teach/ˌsʌbstɪtjuːt ˈtiːtʃ/ /ˌsʌbstɪtʃuːt ˈtiːtʃ/
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