substitute teacher
noun/ˌsʌbstɪtjuːt ˈtiːtʃə(r)/
/ˌsʌbstɪtuːt ˈtiːtʃər/
(also informal sub)
(both North American English) (British English supply teacher)
- a teacher employed to do the work of another teacher who is away because of illness, etc.
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substitute teacher