From Longman Dictionary of Contemporary Englishsupply teachersupˈply ˌteacher noun [countable] British EnglishSES a teacher who works at different schools doing the work of other teachers who are ill, on courses etc SYN substitute teacher American English
Examples from the Corpus
supply teacher• Second, ensure there is a supply teacher available and prepare a schedule of work for all your classes.• A wandering supply teacher came to our rescue.• Returned bus list to Office. 9.15: Checked with supply teacher if she needed my help while Welfare Assistant was out. 