You use off-peak to describe something that happens or that is used at times when there is least demand for it. Prices at off-peak times are often lower than at other times.
The price for indoor courts is £10 per hour at peak times and £7 per hour at off-peak times.
...off-peak electricity.
≠ peak
ADJ : ADJ n
•
Off-peak is also an adverb.
Each tape lasts three minutes and costs 36p per minute off-peak and 48p at all other times.
ADV : ADV after v