professional development day
noun/prəˌfeʃənl dɪˈveləpmənt deɪ/
/prəˌfeʃənl dɪˈveləpmənt deɪ/
(abbreviation PD day)
(especially Canadian English) (British English inset day)
- a day on which classes at schools are cancelled so that teachers can get further training
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professional development day