They practiced waiting their turn.
Meaning: The students worked on getting better at waiting for their turn to speak.
Choice of Words: Practiced means to do something repeatedly in order to improve. Waiting means to stay in one place and not move until something happens. Turn means the time when someone is allowed to do something. Putting them together, practiced waiting their turn means the students did the action of waiting repeatedly in order to get better at it.
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Related Expressions