Choral repetition is when the teacher or a learner models language and the group of learners repeat it together.

Example
The class are practising the pronunciation of the schwa sound. The teacher models words from a list and the learners repeat them together.

In the classroom
Choral repetition is not a very common choice of activity, but it can contribute well to learning some aspects of language, especially pronunciation of connected speech and formulaic language such as classroom language. It is also an activity that many learners enjoy.

Further links:

https://www.teachingenglish.org.uk/article/drilling-2

https://www.teachingenglish.org.uk/article/vanishing-dialogue