Off-peak means outside the busiest hours, and usually cheaper. An off-peak ticket, travel off-peak.
The price difference exists to move people rather than to reward them, since spreading demand is cheaper than adding capacity. An off-peak ticket bought for the wrong train is worth nothing at all.
1adjectiveoff-peakOutside the busiest hours, and usually cheaper.
“They travelled off-peak and paid half the fare.”
off-peak is a quality.
Practised in Time & Calendar