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yard duty
noun the rostered time a teacher spends supervising students in a school playground. Compare playground duty.
Contributor's comments: My wife has only ever heard "yard duty" in secondary schools in S.E. Qld, whereas I have only ever heard "playground duty" in primary schools in the same area.
Contributor's comments: In the Darwin/Palmerston primary schools that I have taught in, playground supervision by teachers has always been referred to as "yard duty".