of a period of less than maximal use or demand or activity
off-peak详细解释
off-peak adj.（形容词）Not in the period of most frequent or heaviest use:非高峰期的或非高峰期使用的：例句：lower rates for telephone calls made during off-peak hours; travelers who take advantage of off-peak fares.在电话非高峰使用段时实行的低收费；利用交通低峰（非高峰）时的低收费标准旅行的旅客
