On-the-spot correction is when a teacher corrects a learner's mistake as soon as they make it.

Example
The learner is telling the teacher about a hobby and says, ‘I am going every weekend'. The teacher immediately elicits or says ‘I go every weekend'.

In the classroom
On-the-spot correction techniques include giving the correct answer, echoing the learner but correcting the language, and using facial expressions and gestures to indicate where the problem was in what the learner said, and therefore encourage learners to correct the mistake themselves.